The government has a monopoly on lots of things that they shouldn’t have. It’s a matter of prioritizing. The US monetary policy is “okay” right now, yes. Not ideal, but making it “perfect” would have no discernible impact on my life. Compare that to fixing things like drug laws, abortion laws, industry graft, immoral taxation, etc. etc.
The number of customers of mutual funds and various investment instruments in the USA numbers in the tens of millions, and virtually every citizen makes use of a bank, which could easily move funds on behalf of customers.
So it’s a little broader than, “one guy” who has the “skills” to not store their wealth in their mattress.
In characterizing money, some people point to a medium of exchange and a store of value as defining. But, an even more important characteristic of the concept is private property. Money is private property; it has to be because property rests on the more fundamental identification that “every man is the owner of his mind and his effort”. (FTNI pg 89.) Money as private property was replaced by force of law. In looking at your posts on the issue, I still don’t understand you. How could this immorality be “okay” with you and of less priority to you for political change?