What did the law require ?
And since when do AI companies care about copyright law ?
And since when do AI companies care about copyright law ?
> After the initial transfer of ownership of a legal copy of a copyrighted work, the first-sale doctrine eliminates the copyright holder's right to control ownership of that specific copy.
As near as I can tell, there is no legal pressure for them to do that. They're destroying them because that's how their scanning machinery works.