Valve PR representative Kaci Boyle said the company’s goal is “not to discourage the use of [AI] on Steam; instead, we’re working through how to integrate it into our already-existing review policies.” She went on to say that the company’s current review process takes into account current copyright law, and that “while developers can use these AI technologies in their work… they can not infringe on existing copyrights.”
Source: Valve won’t approve Steam games that use copyright-infringing AI artwork