Most of these owners aren't doing anything particular to preserve them, they're stacked up with 10,000 other TV Guides in a hoarder's moldy basement. Anyone interested in keeping October 1994's TV Guide pristine has had over 30 years to procure and protect their copy.
These particular buyers are converting their copy to a digital one that's getting some kind of use, which is better than the fate of 99.9% of the other copies.
Everybody imagines libraries hoping against hope to get their hands on all these rare books so they can shelve them and preserve them for generations to come. But if you donate a box of old books to a public library, there's a good chance the clerical staff handling that donation is going to roll its eyes and cart the books out to a dumpster. Large public library systems have stopped taking book donations, for this reason. "Bring them to a thrift store" is what they'll tell you.
The argument wouldn't hold even if you had been on the library's case, because it misconstrues the normal lifecycle of a book. But we don't even get there unless you've been consistent about this, rather than instrumentalizing it at just this precise moment to jump on a trend story about hating AI.