My understanding is that people want to be compensated when their intellectual property is used as training data for a machine. That strikes me as an entirely reasonable expectation.

One person memorizing Harry Potter for their own amusement, even if they make money doing public appearances where they recite sections of the work verbatim for the amusement of the audience is not in any way similar to the process of training an LLM or of that LLM's output. The scale alone is so vastly different that it renders the comparison useless and misleading.