Reddit is suing artificial intelligence startup Anthropic for what it’s calling a breach of contract and for engaging in “unlawful and unfair business acts” by using the social media company’s platform and data without authority.

The lawsuit, filed in San Francisco on Wednesday, claims that Anthropic has been training its models on the personal data of Reddit users without obtaining their consent. Reddit alleges that’s has been harmed by the unauthorized commercial use of its content.

Reddit shares spiked more than 7% on Wednesday, hitting their high for the day after the lawsuit was made public.

The company opened the complaint by calling Anthropic a “late-blooming” AI company that “bills itself as the white knight of the AI industry.” Reddit follows by saying, “It is anything but.”