> with a focus only on books with an ISBN number, the identification system introduced in 1966

So it's not likely to be rare and precious books. It's things which are already in the Library of Congress or its many equivalents.

If they're forced by laws to destroy the results of the scans after training on them, as some have implied, that's bad, on the chance there is some actual lost media in there. But if they keep the scans, or even the transcripts, that's probably an improvement on the status quo, to be honest.

I've had family members in the used books business, and trust me the fate of the vast majority of these books was always to be pulped.