It is true. Essentially, a country bans crypto currency because that country won't get a cut from the profit its constituents get from trading crypto currency. After careful considerations, and alot of lobbying, crypto currency will be allowed to used a country but an exhorbitant amount of tax will be implemented.
It is not only imposing tax on income from cryptocurrency but there are many other factors, which cause banning cryptocurrency. The main problem is that cryptocurrency is not guaranteed. Many people do not invest in it because they think that it is a Ponzi scheme and there is no future of it. People will lose their money. People withdraw their money from banks and that is panic for government.
that's right, if cryptocurrencies are not banned, then the government is afraid that crypto will kill the banking industry, especially the central bank, which is definitely no longer needed if crypto is used