It is not a big deal. Since the invention of the printing press any important book has been duplicated by thousands, tens of thousands or even million of units. Just taking one of those and "destroying them"(it is not destroyed, a digital copy with the ability of doing millions of copies is stored somewhere) is not problematic for Humanity. By the way, I always search for second hand books. Most of the books there ar…
I think you may be greatly underestimating the long tail. Several times a year I read sources that reference older books that I can't find online. When I am able to locate them, they often cost at least several hundred dollars, sometimes into the 10s of thousands.
I have volunteered with a library, and probably threw hundreds of books over a couple week engagement from a university library into a shredder at the direction of a professional, academic librarian. Libraries are constantly culling books, the EXACT category books we're talking about here (old, never-read). This is happening at a much larger scale, so I would recommend railing against university librarians in addition to the AI juggernauts.