It's too late for the thousands of rare books that Amazon alone has bought, scanned, then destroyed. Not even offer to sell them on Amazon afterwards, but destroyed them.
Destroyed
individual books, not every copy that exists. They couldn't sell them again because to be efficient the scanning process requires that the books be disassembled. But even if it didn't, most of them are probably not worth reselling - otherwise they would have been already.
Millions of books are destroyed every year by people who don't want them and can't be bothered trying to resell them, including rare books. Second-hand bookshops are overflowing with books that people gave them which nobody wants. Libraries discard old books all the time too.
Amazon has the right to buy books and use them as they see fit, just like anyone does. If some truly are rare and should be kept then the owners should hold them back, but they don't because they are in it for the money too.
This doesn't just affect books. Almost every product goes through a period where it's just old and worthless, before it's value increases again as nostalgia kicks in and the few remaining examples (if any) skyrocket in value. You may think that's sad, but are you willing to open
your wallet and/or use up storage space to save stuff you aren't that interested in? I have a 'few' examples which I saved from being thrown away, but I've reached my limit and some of it will have to go. The rest will probably be dumped when I die.
It's actually worse than Alexandria. If nothing else, based on number of pages alone.
A silly metric.
Library of Alexandria
A single piece of writing might occupy several scrolls, and this division into self-contained "books" was a major aspect of editorial work... At its height, the library was said to possess nearly half a million scrolls.
What we must remember here is that these scroll were all hand-written. That makes every one
extremely rare, as well as having vastly higher historical significance than the majority of 'modern' books.
It's a pity that Amazon are only using this data for AI training - assuming they are - because it's a valuable resource by itself. However copyright law makes it tricky to use as eg. an online resource. They would have to set up a lending library, or sell each scanned book and then destroy their own copy. Who knows, once the AI bubble collapses they might do that - or sell the entire dataset to someone else who does.
I don't think it's the big deal being made out. OTOH anything that puts the boot into AI excesses is good.
