if enough armed people refused to pay and told the government to go fuck itself there is nothing they could do.
If you are pertaining to the countries today who has people that are continuing to pay taxes then they cannot do anything about that since every country in they world does have their own laws that has been created by their own governments.
Governments are providing different services. They ask for tax. This is an operating chain of countries. Without taxes, governments can't provide services. Then we should give our tax to governments. This tax can be because of crypto too.