I wonder what could the US possibly offer, that other countries can't at the moment?
Lots of cheap (empty) hosting space that has lots of power and cooling available since it was used for hosting industries before hand.
For 'real' data centers, the ones that Google / Microsoft / IBM / etc. use it's usually cheaper for the mega corporations to build a new center with more modern everything then upgrade the old ones.
For 2nd tier stuff, like mining it's nice to be able to move into a facility that already has power / cooling / etc.
Yes, it's going to cost more to run since the generators if needed are older and less efficient and the chillers are going to be older and less efficient.
But, since they just got kicked out of China, these facilities are already there and available. Don't have to spend time building stuff, getting permits, waiting for whatever.
You know that it has "X" amount of power and "Y" amount of cooling that works. Just bring in the miners and plug them in and go.
-Dave