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Reddit Sues Anthropic for Unauthorized Use of Data in AI Training

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La voix du futur
6 minutes de lecture

On June 4, 2025, Reddit, the famous social media platform, filed a lawsuit against Anthropic, an artificial intelligence start-up, accusing it of using its data without authorization to train its AI models, notably the chatbot Claude.
This lawsuit, filed with the Superior Court of California in San Francisco, is part of a growing wave of disputes over the use of third-party content by AI companies. Here is a detailed overview of this case and its implications.

Contents

Background of the Case

Reddit, a 20-year-old platform that went public in 2024, hosts millions of user-generated discussions covering thousands of topics. This data is valuable for training AI models because it captures authentic, nuanced, and varied human conversations. According to Reddit, Anthropic exploited this data without concluding a licensing agreement, unlike other tech giants like Google and OpenAI, which negotiated partnerships to use this content legally.

In its complaint, Reddit claims that Anthropic accessed its servers more than 100,000 times since July 2024, even after the start-up claimed to have blocked its crawling bots. Reddit argues that these actions violate its terms of use, which prohibit unauthorized scraping and commercial exploitation of its data without user consent. Ben Lee, Reddit’s legal director, stated: “We believe in an open internet, but AI companies must have clear boundaries on how they use the content they extract.”

Reddit’s Accusations

Reddit raises several grievances against Anthropic:

  • Violation of terms of use: The platform alleges that Anthropic ignored its robots.txt files, a standard that signals to automated systems not to crawl a website.
  • Lack of consent: Anthropic allegedly trained its models, including Claude, on Reddit users’ personal data without their permission, a practice deemed harmful.
  • Unjust enrichment: Reddit claims that Anthropic enriched itself by “tens of billions of dollars” by exploiting its content without offering compensation to users or the platform.
  • Contradiction with Anthropic’s image: Founded in 2021 by former OpenAI executives, Anthropic presents itself as a responsible AI player, emphasizing safety and trust. Reddit describes this stance as an “empty marketing gimmick,” arguing that their actions contradict this image.

Reddit is seeking compensatory damages, restitution for Anthropic’s enrichment, and an injunction to prevent future commercial use of its data.

Anthropic’s Response

An Anthropic spokesperson responded by stating:

“We disagree with Reddit’s allegations and will defend ourselves vigorously.”

The start-up, backed by Amazon and Alphabet (Google’s parent company), did not provide further immediate comment. In 2023, Anthropic had argued in a letter to the U.S. Copyright Office that training Claude constituted “fair use par excellence” of data, implying a statistical analysis of vast sets of content. However, Reddit is not basing its complaint on copyright infringement, but on breach of contract and unfair competition.

A Broader Context

This lawsuit is part of a series of legal conflicts over training data for AI. The New York Times sued OpenAI and Microsoft for unauthorized use of its articles. Authors like Sarah Silverman have sued Meta for training models on their books without permission, and music publishers have filed similar complaints against generative AI start-ups. Reddit, for its part, has already concluded lucrative agreements, such as a $60 million annual partnership with Google and an deal with OpenAI, to enable regulated use of its data.

For Reddit, these licenses represent a crucial new source of revenue since going public, as it seeks to monetize its massive user base. Reddit’s market value stands at approximately $22 billion, while Anthropic, valued at $61.5 billion in March 2025, is a major AI player, competing with models like those from OpenAI.

Implications and Perspectives

This dispute raises key questions about the ethics and legality of using public data for AI. As data sources become scarce, platforms like Reddit are locking down their content to demand compensation. “AI companies should not be able to extract information without clear limits on its use,” Ben Lee stressed. The lawsuit could force Anthropic to negotiate a deal, as Reddit hopes, or influence courts to impose stricter rules on scraping.

This case, Reddit Inc. v. Anthropic PBC (No. CGC-25-524892), marks the first time a major tech company has sued an AI start-up over its data training practices, according to recent reports. The outcome could redefine how AI companies access online content, with repercussions across the industry.

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