So? First off, the whole argument behind these models has been from day one that training on copyrighted material is fair use. At most this would be a TOS violation. Second off, AI output is not subject to copyright, so it has even less protection than the original works it was trained on. Copyright maximalism for me, but not for thee. It's just so silly for someone working at OpenAI to complain about this.
The chats include human output too, which is presumably copyrighted, and is presumably necessary for training purposes.