> I can't copy a book I read if it's still under copyright, even if I were to type the entire contents out after reading them. I also can't narrate those same words in full, because that's one of the rights retained by the author.

Isn't this only true if you distribute those reproductions? Would it be illegal for me to take detailed notes (for my own viewing) about a book, even if they were substantial portions copied verbatim?

GPT-3 and the like aren't reproducing the works they're trained on, they are substantially transforming them.