So, outside of the Fed, there are maybe two more that have some relevance that are privately owned (Japan, Switzerland). The second most important one (ECB) is

So, outside of the Fed, there are maybe two more that have some relevance that are privately owned (Japan, Switzerland). The second most important one (ECB) is not. And, of course, the ownership of the Fed (or the ECB) could be changed by changing laws (the Bank of England is an example here of how central banks might enjoy changing degrees of freedom). Addendum: to say that it is not easy to change the law is ok, maybe it should not be. But to use some technology to get around laws where there is not enough social capital for change is a very tricky position. If that holds for law X, why not law Y? What if there is never enough social capital for change? Would it then imply a break-up of that society into multiple ones?