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.
I’d personally choose the latter, especially given that the 1994 tv guide is not going to meaningfully improve the utility of the language models.
Direct access to pre-digital history is drying up rapidly, why accelerate that for incremental benchmark gains in a domain that isn’t even relevant to the most useful forms of a nascent technology?
A physical book in a museum archive is useless for 99% of the worlds population even if they really wanted that specific book and were able to find it, as they'd have to arrange for access, then travel (at incredible expense) to access it.
Maybe they could ask the museum to digitize it, but that's still going to be days of delay and tens of dollars of cost to access parts of that book, if the museum even offers that service. If we go slightly beyond your "melted into" statement, the chances of the book becoming useful to the public are much higher in the AI company's digital archive, which might turn into something like what Google Books could have been, given the right incentives and copyright law changes.
And of course that presumes that the TV guide is going to stay in the museum rather than been thrown out as part of curation (or realistically, long before it makes it into a museum). Neither museums nor archives hoard everything, throwing stuff out is - as far as I know - one of the key jobs of an archivist. And a 1994 TV guide, while useful to understand what it was like to be alive in 1994, likely doesn't contain much unique information. You don't need that specific guide.
If there are 52 weekly editions, of 10 different guides, you would likely get most of what you want from any one of them. And for the parts that you wouldn't - there's a good chance that you'll have a much easier time getting the essence of this knowledge from the anonymized data pool that all the content was melted into, rather than chasing 10 different museums to find the original magazines.
https://genome.ch.bbc.co.uk/about
Historic TV guides are also the sort of strange ephemera that people collect. They ought to be digitized like newspapers and other magazines, but this was always the purview of libraries anyway.