Some of the world's largest music publishers filed a blockbuster lawsuit against Anthropic late Friday night, alleging "one of the largest and most blatant ongoing thefts of intellectual property in history."
They destroy the books because it allows them to scan them better. With the spine sliced off, a machine can automatically go through the pages, and there is no distortion or shadow at the middle.
There's no need to do this legally - they could donate used books. The argument shows that the final product is transformative, so it doesn't matter whether they keep the books or not.
LLMs can reproduce quite long passages of books, though I don't think this changes the argument much, because it's not reliable or useful.
I always thought there was in obvious win where companies doing this could be forced to archive the scan publicly (after some period of time). They'd be able to use it/sell it for training, but we wouldn't lose rare books forever.