[BAReF00t]

What do you think happens to electronics that are sent back during warranty due to being defective?

They are mostly "refurbished" (=repaired and cleaned), and then sold again. If possible, even as new. Or, of course, sent back fixed.

[_delirium]

I'd be open to any contrary numbers on this, but my expectation has been that most mobos pulled out of service, especially by high-volume operators like the AWS datacenters, are just junked, not repaired or refurbished.