Generally there are a number of valuable components on the waste boards which can be parted out, and often kept on-hand for other repairs. Each of the chips on those boards are valuable for future repairs, and (in the USA at least) often quite difficult for repair shops to obtain. Here[0] is an example of such a chip from a MacBook Pro - it's a proprietary, custom Apple component so generally you can only obtain them through salvage.

I don't know if this shop sells any of their scrap into the scam industry, but I bet they'd have a white-hat market available for a lot of it.

0: https://store.rossmanngroup.com/zc8-u9850-edp-mux-a1707-a199...