In 2 years the next generation chips will be released and th se chips will be obsolete.
That's truly e-waste. Now in practice, we programmers find uses of 10+ year old hardware as cheap webhosta, compiler/build boxes, Bamboo, unit tests, fuzzers and whatever. So as long as we can turn them on we programmers can and will find a use.
But because we are power constrained, when the more efficient 1.8nm or 1.5nm chips get released (and when those chips use 30% or less power), no one will give a shit about the obsolete stockpile.
I assume even really out of date cards and racks will readily find some use, when the present-day alternative costs ~$100k for a single card. Just have to run them on a low-enough basis that power use is not a significant portion of the overall cost of ownership.