Ethereum accomplishes the same thing without using the power of a small country.
It's a worthwhile tradeoff.
50% attack is real.
The best is our grown PoS system we currently call us dollar, euros etc.
Bitcoin not even solved the account recovery feature or any fraud protection.
"Thus inflation becomes the most important psychological resource of any economic policy whose consequences have to be concealed; and so in this sense it can be called an instrument of unpopular, i.e. of anti-democratic, policy, since by misleading public opinion it makes possible the continued existence of a system of government that would have no hope of the consent of the people if the circumstances were clearly laid before them."