Well, there are BTC ATMs in many countries, You can buy stuff with BTC. And New Zealand, though not yet a nuclear hegemon, will allow salaries to be paid BTC. So I guess you could say BTC is usable.
https://markets.businessinsider.com/news/stocks/new-zealand-legalizes-cryptocurrency-salaries-including-bitcoin-2019-8-1028442320
Biting the hand that feeds IT
