What do YouTube tech reviewers do with all the tech?

As asked in the title. Anyone have insider information? Speculations are welcomed. It just seems such an e-waste, but at the same time some reviewing more well known techs are helpful. But those whose goal is to make their video entertaining rather than informative like going on a tech shopping spree on Amazon or Aliexpress to show the "smallest" gadget in a certain category or something similar is adding to the waste.