It's not an allegation https://www.washingtonpost.com/technology/2026/01/27/anthrop... (if you're talking about the "rare or unique" part, yeah that might be bs)
But in my opinion, treating mass produced books like they're this sacred untouchable object is ridiculous. They're not "source" material, they're just a copy as well, and they're not "priceless" by any means. They're very reasonably priced, perhaps even so cheaply priced that books can be bought in bulk in these amounts. Buying used books and doing whatever you want with them is just legal. Used books, that would probably be just laying in some warehouse, or recycled anyway.
If there's anything to have gripes with, it's the copyright system that makes it easier to take this legal route.