LocalLLaMA

Personally I don't think copyright holders really have a leg to stand on as far as that goes. Simply having and using a copyrighted work isn't a violation, and the work that is produced in the form of a trained neural network is the very definition of transformative. I also think Meta would have the same issue with trying to use a copyright claim for someone using their llama output to improve other non-llama models. That's why they had to slip it into a terms of service.

I guess what you might see going forward is every book that's published comes with a user agreement you agree to by opening the book... But that doesn't sound practical in any sense.