"Clean room" is doing a lot of heavy lifting. Having the entire corpus of knowledge for humanity and how LLMs work, how can you honestly argue in court that this is purely clean room implementation?
This is right up there with Meta lawyers claiming that when they torrent it's totally legal but when a single person torrents it's copyright infringement.
Far too many people treat AI as a way to launder copyright, it seems likely that a lot of the current state of outright plagiarism won't stand up in court