If the governments of some countries think, or create, their own cryptocurrency. In that case I think a much higher transaction fee will be required.
There are many revenue taxes where 17-25% tax has to be paid. The activities of the government of some countries will be like this. So the crypto community will suffer. However, with the increase in the level of transactions in some countries, the revenue may decrease. There is a lot of writing in newspapers and magazines about cryptocurrencies. According to experts there, it is not possible to collect any revenue from cryptocurrency. So not allowed in most countries.
If the government of a country works for the betterment of the nation after creating its own cryptocurrency, it will surely succeed. The country will develop with an increase in the amount of total resources.