People forget that government authority comes from their monopoly on the right to bust down your door, take your physical possessions, and imprison you. Sure, you might have billions of dollars worth of BTC, but that's no good for you from the inside of a prison cell or if the government prevents you from acquiring the physical possessions that wealth normally lets you buy.

If you come up with some way to cheat the tax man, the tax man will come up with a way to make you pay interest and penalties. One man can evade all of the taxes, and all people can evade some of the taxes, but all people can't evade all of the taxes. The state always wins and will always take as much of a cut of the economy as it wants to.