So if you Cross China, India (shutting down BTC), EU, USA taking over btc infrastructure, what is left? Sealand? sure the rest of the world can withstand a 51% attack.
Who the hell would spend billions on a 51% attack, and what the hell do they expect to get out of it? 51% attack doesn't automatically destroy bitcoin. At best, it lets the attacker double-spend. It doesn't change the rules of the network, since those are maintained by miners
and wallets, and it doesn't even block transactions fromm going through, as there is a very easy fix for that.
USA and EU would propably rather shutdown Internet than lose control over Euro or Dollar.
That would be pretty fun to watch, as every single citizen in the country protests to the point where the politicians who did that are literally dragged out of their government buildings and shot. Though I doubt it would ever come to this, since politicians know they need votes to keep their office, and would rather get anonymous bitcoin donations than vote for laws to shut down the internet.