You just rescinded my permission to use the Ethereum fork of my choice because you don't want to accept it.

Thats a weird definition of permission. You can send it to me if you want, no ones stopping you there.

I would still need permission from my bank to purchase the Ethereum from an exchange.

Yes, definitely sucks, but thats an entirely different problem. The fact that banks can stop you from using your money how you please is the problem that crypto solves. Once you have crypto no one can stop you from sending it to whichever address you want

The bank cannot refuse to give me my money.

Never heard of withdrawal limits or spending limits or bankruns? The bank can refuse to give you your money, has happened numerous times in history

If I owe you money, you have to accept it in the paper currency of whatever nation we're in.

That's permissionless.

Like bitcoin in El Salvador and in the Central African Republic?