LLMs have been caught plagiarising works, by the simple nature of how they function. They predict the next word based on an assumed context of the previous words, they're very good at constructing sentences but often the issue is "where is it getting its information from?" Authors never consented to their works being fed into an optimisation algorithm and neither did artists when DALL E was created.
For authors, you buy the book and thus the author is paid but that's not what happened with ChatGPT.