If they want they can and nobody can actually stop them but it won't be fair just to impose such kind of tax especially for crypto alone so they have to follow same thing to stocks too and if that happened then every billionaire has to pay millions of dollars to the government so they will not be in support of such taxation which means that kind of taxation will not be imposed.


Yes, you can via mixing the coin which can help with breaking the links between your origin address and destination.