“No longer requiring a gold reserve backing the paper money, the governments had the ability to create money out of thin air, change inflation rates at will, and impose more regulatory control and surveillance on the citizens, who were legally forced to use fiat money.”

This part is more polemics than economics.

“The primary mechanism to generate revenue for most government enterprises switched from value-adding ventures to exploiting the citizens, in the form of inflation, taxation, interest rate manipulation, and various types of capital, wage and price restrictions.”

The relationship between the end of the gold standard and the rise of ‘finance capitalism’ is definitely there chronologically; whether there is a functional relationship there is a very interesting question that had never occurred to me — but it cannot be merely presumed.

Crypto’currencies’ (which really are virtual gold, not money) cannot replace legal tender (which is what you are talking about when you use the words “fiat money”) unless that is legally mandated through government, which isn’t going to happen — ever.