free electricity
Well that's only in China ... but the west is not free electricity ... and the west will crave demand if the coin tap stops.

Beetcoins are fungible, the ones mined in China are no different from the ones mined in the west, you can't "buy domestic," if that's what you're thinking. And industrial power rates are a thing in the west too, aluminum smelters aren't paying residential rates, more like 4 or 5 cents per.
BTW, wonder why exchanges don't do this more often.

They know exactly what it takes to burn the longs/shorts.