From a quick web search I can find that there are book review sites that allow users to enter and rate verbatim "quotes" from books. This one [1] contains ~2000 [2] portions of a sentence, a paragraph or several paragraphs of Harry Potter and the Sorcerer's Stone. Could it be plausible that an LLM had ingested parts of the book via scrapping web pages like this and not the full copyrighted book and get results simila…
https://www.reddit.com/r/DataHoarder/comments/1entowq/i_made...
https://github.com/shloop/google-book-scraper
The fact that Meta torrented Books3 and other datasets seems to be by self-admission by Meta employees who performed the work and/or oversaw those who themselves did the work, so that is not really under dispute or ambiguous.
https://torrentfreak.com/meta-admits-use-of-pirated-book-dat...