If you don't like the way your taxes are spent, join a political party and try to change the system.
If you don't like paying taxes to the government, try to emigrate to a country where taxes are lower.
The Ukranians are lucky to pay tax at such low rates; not many countries have income tax at lower than 20%.
In Ukraine pretty much everyone evade taxes, workers get small legal salary and then the rest of the salary in cash, freelancers don't declare their income because it's nearly impossible to comply with regulations, businesses (including the mega-rich) are always looking for schemes that make them avoid taxes. The tax bodies in Ukraine don't work the same as in the West, they don't chase citizens unless they are really rich, and in Ukraine any income is legal until proven otherwise. So, when people sell small amounts of coins on exchanges (up to ~$5,000), they just withdraw it to their bank account and most likely won't have to worry about taxes.