This is such an amazing take... if "training" an LLM with a book is fine, if you rewrite the book with slightly different wording... are you plagiarizing it? if you are then every application of AI over trained data of that trained data is plagiarizing?
Say you have this Math book and you rewrite it from third to first person and then replace all the sine examples with cosine and modify the exercises to have different numbers... is it stealing? you can buy 1 book, "train on it" and then generate your "personal original approved copy"