What evidence do we have that they are "destroying" books?

I'm not saying this in their defense, but as someone who has worked at companies who has scanned books at scale, and generally speaking, I wasn't on site there, but I knew we/they were pretty delicate with the books. And while the kneejerk reaction might be "hey, why would they go through the effort?" -- my guess is that they are following or even hiring people that have done this process in the past (out of laziness) and just follow what works easiest. The literal machinery is not designed to destroy the books for various practical reasons. Books that are bound are easier to be kept in order and work with. Getting a flat scan is done with specialized tools, you don't need to put it on a plate (it would be too slow that way anyway)

All of the above is just to justify my question: Who knows that the books are being destroyed? (I also agree with the general sentiment that there's a good chance these books are just cheap and bulk, they aren't pulling one of a kind rare books.)