maybe more precisely is to protect people in that country. The government banned crypto because the market and use of crypto is very free. cannot be monitored, there is no control from the government. so that it's easy in fraud, crime and crime. a threat to the bank, I think it doesn't really matter, because the bank has also started moving on the blockchain. the use of crypto currencies is unlimited. while countries have limits and rules. this is the reason being a country bans crypto