It is a myth to believe that Governments need to exist to offer currency value. That's just a Keynesian flaw.

You can trade in seashells or tallysticks, or just run off into the wilderness and live off the land, "UNTIL" the tax man shows up demanding his cut that can only be paid in the denomination of the state's unit of measure. He brings with him the full force of that state to take everything you own and incarcerate you if it pleases him. Been there and done that - - once.

Taxes are what drive the demand for any modern currency and give fiat its value in commerce. Grocery coupons are a form of currency, but good luck getting them accepted as a dominate vehicle of commerce and trade. The unit of measure the government produces at will also allows it to provision itself at will without a revenue stream separate from the economy. Governments neither have nor don't have "money" because they create what they need on demand by spending into the private sector.

As long as they spend more than they take back in taxation their currency will become a store of value to satisfy the people's desire to net save and retire private sector bank debt. This makes revolt, or even modifying the system, extremely difficult, but go get those windmills Don. You be you.