Many Countries have put restriction and banning crypto currencies. In this situation which country you think is supporting crypto currency activities? where Exchangers and traders have favorable environment.
other than japan and singapore, those countries that have very strong political governments like usa russia and china are harsh on cryptos. they dont like to lose control over what its citizens can hold. usually those in 3rd world countries where government are not aware of cryptos or dont even care, these are heaven. some developed nations in europe are also friendly to cryptos, like switzerland and denmark.