I think besides getting tax in every transaction which is impossible to be control by the government, Bitcoin will just simply help the economic status of one government. as long as the people benefits then the government will also benefit it will lessen the poor and lessen the corruption.
The fact that the government tax even the tiniest things in life still exist and bitcoin is not an exception to it. Always remember that most politicians does not care for the common good, but rather they would legalize bitcoin with the intent of exploiting it for themselves, therefore bitcoin would be legalized one way or another. In the future, there would surely be countermeasures prepared and maybe right now, governments are developing a concept to tax crypto into a certain degree.