Earlier quoted context omitted.
That you apparently think fair use is something you just think about real hard in order to see how you feel about it in a given situation demonstrates that you do not understand the concept of fair use. There are rules.
Yeah, I realise that now. However, where does one draw the line between fair use and derivative works? Creating something based on other stuff (Google creating AI books from the existing ones for example) would possibly be fair use I think but would it not also be derivative works?
Google Books is considered fair use because they got sued and successfully used fair use as a defense. Until someone sues over Copilot, everyone is an armchair lawyer.