I do not think this logic works out. Tax collectors would just ultimately have a lot of bitcoin. That is the reality of the society we live. Resources move towards the center, or towards the so-called commanding heights.
They wont have alot of bitcoins because the tax collectors dont accept bitcoins.
But if they tax bitcoin, then the price of bitcoin will go down since everyone has to change it back to their local fiat to pay it, thus the more tax you put into bitcoin, the more it will destroy it