Other countries do not allow crypto because they are afraid of taking a big risks. Making crypto as a fiat in each country will be a big step to take and not all countries are aware that crypto is already existing.
These governments might also not ready to allow cryptocurrencies or they had different views that prevent them in permitting their people to use virtual currencies. Some governments allowed cryptocurrencies by imposing taxes abd regulations to monitor movements of the coins and lrevent from falling into the hands of men that involved in illegal activities.