The e-waste argument is a red herring at a time when people are paying double or more for several generations old hardware. By the time these are indeed e-waste it will be because they're e-waste worthy, not because usable hardware was ditched early on.
So too is the "could have been used" issue. These are chips that are being recycled that were not production worthy.
https://www.tomshardware.com/news/n...p-crypto-mining-gpus#xenforo-comments-3690003
Using viable GPUs would impact the supply of Geforce gaming cards. To use a phrase, this is free silicon for the taking. Your contention may be correct on the AMD side as we know all of about nothing at the moment, but I suspect its the same situation. AMD will recycle defective dies that don't meet production specification. This is about as win-win as it can get.