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A week into the Musk v. Altman trial, which features two towering figures in the tech industry facing off in a case that could have major implications for OpenAI, the plaintiff has made his central message clear to the jury.

“You can’t just steal a charity,” Elon Musk, the world’s richest person, said repeatedly during his time on the stand at a federal courthouse in Oakland, California.

Musk’s testimony was the centerpiece of the trial’s first week. It comes two years after the Tesla

and SpaceX CEO first sued OpenAI CEO Sam Altman and Greg Brockman, the company’s president, alleging they went back on their promises to keep the artificial intelligence startup a nonprofit and to follow its charitable mission.