Ok, but how does that help them? Unless they're buying digital goods, all of their spending will be concentrated domestically. Without international trade (as nobody will do business with them for the aforementioned reasons) -- it's not like DHL is going to airdrop in their Amazon Prime purchases. Their welfare does not improve through "irreversibility" (in quotes, because a hose is all it takes to reverse any crypto transaction). In general, irreversibility hurts their welfare through breakage. Their transactions aren't guaranteed if the internet is censored, which in Iran, it is.

The government already has total control over the domestic economy, and can coerce you through violence. What have you gained other than a dramatically less energy efficient economy?