They probably go to refurb which DJI is known to have excellent refurbs probably because they have the latest parts, they have good screening and a deep process (not just cosmetics), and as you mentioned, they likely make use of the repair...
Totally understand your reasoning for this. I see two sides here, one is if there is an outright ban getting one will be even harder and the black/gray market will be in full swing at pretty outrageous prices. If we already have one we won't have...