You're trying to imagine rare valuable books and then fantasizing about AI companies destroying them, but what's actually happening here is that AI companies are acquiring, digitizing, and then pulping the instruction manuals to 1983-vintage copy machines.

This is all such a special-pleading argument. You know what other institution snatches up books and destroys them at huge scale? Public library systems. People clean out their attics and basements and drop off huge boxes full of books at libraries; libraries take the things they know will circulate, and destroy the rest. Take a guess as to how Þórbergur Þórðarson fares at the Newark Public Library. Wait, bad example, they stopped accepting book donations because nobody wants your old books. They tell you to give the books to thrift stores instead. Guess what the thrift stores do with them?

You know how many times I've read stories about the grave damage libraries are doing to human culture? Zero, zero times.