Where does old hardware from public cloud providers go?

Google has a whole thing on this (https://sustainability.google/projects/circular-economy/) that I find super fascinating.

Many companies have annual sales of out dated hardware and other items which are made available for purchase to employees and to their freinds and family.

My general experience with this is that employees receive an email list of the items for sale and family and friends can purchase these items through said employees.

I have obtained a few office chairs, servers and video game systems through friends.