Lot of countries do not allow to use crypto currencies and they discourage using them. However as far as I feel, trading with crypto is not that harmful for the economy of the country. As an example, if a person has Eth and someone from another country needs to buy Eth, that buyer needs to pay the seller in terms of dollars. Then that seller needs to convert that Dollars to his native currency which means it creates a the demand for the native currency and increase the value of the currency. May be the government is unable to add a tax on such transactions but it is beneficial for the currency used in seller's country.
What do you think about that?
many countries still want income from the tax sector, especially incoming goods taxes, while bitcoin is still not taxed for a while and the government is still having trouble monitoring the movement of bitcoin as long as it has not been converted to the country's original currency, so the added value for some countries is not can be felt, so there are still many countries that still use banking services because the existing system is very transparent and easily taxable in addition to maintaining the stability of the country's currency value ..