shrug, difficulty adjusts, asics get smaller, cooler, enclosures designed differently, miners hide them in drywall or wherever we hide prohibited stuff these days.
Criminals have customers so their customers would exchange his money for BTC with another criminal before. I guess it is pretty much like how it works today.
So now law enforcement has to shut down every Bitcoin node in the world, including the ones that are run exclusively on tor in 3rd world countries, AND shut now any new ones that pop up?