That's a very different use case IMO. An LLM isn't generating a replica of a book for the users. At most we've seen people able to reproduce exact portions of stuff, but only with lots of prior knowledge of the material by the human in the loop and plenty of manual effort (aka not a direct commercial threat). And that was before more LLMs put effort into stopping that sort of hacking.

The last thing the world needs is more nonsensical copyright law and hand wavy regulation funded by entrenched interests.