It stands to reason that crypto is going to flourish in the places with the least bean-counting regulatory interference and authoritarian government meddling. Meaning not America. But at the same time, definitely not China either.
Not automatically. If they could come up with something lightweight and assured people that was how it was going to stay that may attract more people. We all know though that they're incapable of being anything other than a lumbering beast.
Having to give Americans the boot must cost exchanges a great deal of money, but I guess not more than the cost of accommodating them. If they could tweak that they'd do well. They won't of course.
I wouldn't be reassured by a place operating out of the loosest jurisdiction they could unearth. The chances are high they'll just continue to migrate when they tighten up and eventually run out of options.