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Millions are drawn to the Undertale and Deltarune fandom for a reason: the games, created by Toby Fox, blend memorable characters, intricate narratives, and a unique approach to player choice. The result is a passionate online culture that thrives on fan art, theories, memes, and, crucially, sprawling wiki projects. On Fandom.com, editors and readers have built detailed databases documenting every secret, dialogue path, and musical cue. These wikis serve as more than guides—they’re social spaces where fans trade discoveries, interpret lore, and often experience their first taste of online community leadership.
As the Undertale and Deltarune wiki communities expanded, tension followed. Fandom.com’s acquisition of Gamepedia and other independent platforms in 2018 triggered a wave of consolidation, bringing once-autonomous game wikis under a single, for-profit entity. For a community that values creative freedom and collaborative lore-building, this shift introduced new rules around monetization, content, and moderation. Editors faced the imposition of autoplay ads, promoted content, and abrupt changes to site policies—often without transparent communication from Fandom’s corporate leadership.
At the heart of the controversy is a clash between technical infrastructure and community autonomy. Fandom, Inc., operating out of the Hallidie Building in San Francisco, is owned by TPG Inc., a major private equity firm. After TPG and Jon Miller (former AOL CEO) acquired Fandom in 2018, their focus shifted toward maximizing ad revenue and search engine optimization. This led to the migration of nearly all wikis to the fandom.com domain, a move that boosted traffic and advertising impressions but degraded site performance for many users. According to Similarweb’s October 2023 data, fandom.com ranked as the 50th most visited website globally, with over a quarter of its traffic from the United States and nearly 8% from Russia. However, this scale came at a price: fans complained about the new interface, calling it “nearly unusable” due to unstable ad placements and constant cross-promotion.
For Undertale/Deltarune wiki editors, the problems extended beyond intrusive ads and sluggish load times. Many described a loss of editorial control. Fandom’s terms of use prohibit hate speech, libel, pornography, and copyright infringement, but they also allow the company to remove or alter content at its discretion, regardless of local consensus. Editors reported sudden insertions of promotional videos and unrelated quizzes into articles, which cluttered pages and undermined their work. Some contributors alleged these features were introduced to boost engagement metrics, not to serve the wiki’s informational mission.
This shift had real consequences for the volunteers behind the wikis. Years of work cataloging Undertale’s branching storylines and secret endings were disrupted by malvertising, slow site performance, and unexpected content changes. The Guardian criticized Fandom’s monetization model as exploitative of unpaid editors, while the Journal of Student Research described it as an “informational monopoly” that stifles competition. In 2023, after observing other game communities migrate away, some in the Undertale/Deltarune fandom began debating whether their own wiki should move to an independent platform.
Trust issues deepened with the introduction of AI-generated “Quick Answers” on wiki pages. These AI summaries were marred by grammatical mistakes and factual errors, prompting backlash from editors. Fandom eventually removed the feature, but the incident exposed a disconnect between the company’s priorities and the community’s standards. The increasing use of generative AI tools raised additional fears: some editors worried that their contributions were being used to train commercial algorithms without their consent. In March 2026, the Grand Theft Auto Wiki team cited this concern as a key reason for leaving Fandom.
Privacy concerns have also become a flashpoint for criticism. Fandom’s privacy practices have drawn scrutiny, especially regarding the use of third-party trackers and data sharing with advertising partners. In 2023, Fandom’s privacy policy acknowledged the use of cookies, web beacons, and similar technologies to collect user data for advertising and analytics. Reports from advocacy groups such as the Electronic Frontier Foundation have highlighted the risks of pervasive tracking on fan platforms, especially for younger users, though no major class action lawsuits or court-ordered damages against Fandom were documented as of May 2026.
The question of whether criticism is fair remains complex. Fandom argues that centralization offers technical benefits, security, and greater visibility for fan communities, including Undertale/Deltarune. The MediaWiki software powering Fandom—upgraded to a customized version 1.39 by May 2023—includes extensions for chat, badges, forums, and multimedia. Fandom claims its infrastructure supports volunteer editors with robust servers, Creative Commons licensing, and partnerships with game publishers. In 2021, for example, Fandom collaborated with the US Navy to promote esports tournaments through Twitch, embedding streams on wiki pages.
Despite these advantages, many editors argue that corporate policies stifle the creative storytelling and non-neutral perspectives that define the Undertale/Deltarune fandom. In May 2025, Fandom introduced new “brand safety” guidelines to sites like Giant Bomb, sparking backlash for limiting editorial independence. Technology reporter Ethan Gach described Fandom’s leadership as driven by “enshiftification”—the relentless pursuit of profit at the expense of user experience and trust.
Centralization has also led to the phenomenon of forking and migration. When a wiki community leaves Fandom for independent hosting, Fandom often keeps the abandoned (“forked”) wiki running under the original name and content. Because Fandom controls key domain names, these old versions can outcompete new sites in search rankings, sometimes displaying outdated or incorrect information to readers who are unaware of the migration. This dynamic has affected multiple game wikis, including those for Minecraft, Zelda, RuneScape, and Terraria, especially after the 2018 integration of Gamepedia into Fandom.
For the Undertale/Deltarune community, the debate remains unresolved: is it better to stay on Fandom, with its vast reach and technical support, or move to an independent wiki that prioritizes creative freedom over ad revenue? Some point to the success of independent projects like Wiki.gg and Weird Gloop—platforms founded by former Fandom admins—as evidence that fan communities can thrive outside the corporate ecosystem. Others worry about the visibility and sustainability of such splinter sites, especially when Fandom’s search engine optimization can bury new competitors.
Allegations of censorship have further divided the community, especially regarding adult material and LGBTQ+ topics. In 2021, Fandom began deleting entire wikis and pages documenting adult content, often without advance notice. In 2022, several sexuality and gender wikis were merged or deleted, with some users reporting that material offensive to intersex identities was incorporated. Protests against these changes led to some users being blocked on both social media and the wikis themselves.
Monetization continues to be a sore point. Fandom’s revenue comes from direct and networked advertising, including partnerships with Google AdSense and Amazon Ads. In November 2025, Fandom changed its ad policy so that only active editors would receive a reduced-ad experience; logged-in users who aren’t editing are shown full ads. For volunteers who contribute thousands of words and hours, the lack of compensation or recognition remains contentious. In June 2023, McDonald’s paid Fandom to temporarily replace the McDonald’s Wiki’s main page and a major article with an ad campaign, sidelining the work of primary contributors.
The use of AI for moderation remains controversial. In early 2024, Fandom increased its reliance on generative AI for tasks like image review, aiming to cut costs and improve efficiency. Editors, however, worry about algorithmic errors and the risk of further marginalizing human voices. In February 2025, Fandom launched “FanDNA Helix,” an AI model trained on all wiki pages and users’ social posts, designed to help advertisers target readers based on their activity.
Misinformation presents another challenge. At the end of 2024, fact-checking groups such as AFP and Media Matters for America reported that Fandom wikis were being used to spread conspiracy theories. A notable incident involved Amazon Alexa redirecting users to a fictional Fandom article about Hurricane Milton—a disaster that never happened but was described as real. Fandom removed the page after backlash, but the episode highlighted the risk of user-generated platforms amplifying mistakes alongside accurate information.
Departures from Fandom have accelerated in recent years. In 2023, Fandom CEO Perkins Miller told The Verge that he takes migration “very seriously,” but that hasn’t stopped high-profile communities from leaving. The editorial team behind the Zelda Wiki cited “corporate consolidation” and limitations on independence as reasons for their departure. In 2025, the teams behind the Ys, Trails, Xanadu, and Gagharv wikis migrated en masse to independent platforms to create more comprehensive, ad-free repositories.
Forking—when a community leaves and Fandom keeps the abandoned version running—creates its own problems. Fandom removes administrator rights from those involved in new projects, and search rankings make it hard for readers to find the “real” wiki once it’s moved. Sometimes, two wikis with the same name coexist online: one up-to-date but obscure, the other widely seen but outdated.
The legal and regulatory environment around fan wikis is evolving. Copyright lawsuits have targeted Fandom over the unauthorized use of professional imagery, with plaintiffs including photographer Linda Matlow and film director Michael Grecco.
As of May 2026, the Undertale/Deltarune wiki community continues to debate the balance between creative freedom, community control, and technical sustainability under for-profit ownership, centralization, and monetization. The controversy over Fandom’s “FanDNA Helix” AI model and its implications for user privacy and targeted advertising remains unresolved.