Yeah, there have been some quiet yet serious proposals about personal carbon rationing in recent years. People on the farther left are uncomfortable with carbon taxes or tradable credits because of inequality.
Let's say we impose a $100/week gas limit via CBDC. Immediately I would list ads on CL to trade my $100 credits for $200.
Gov can't stop it. Rationing just breeds further market inefficiencies.
Instead of cash trades, the gas-consumer could buy me a $200 Amazon gift card, etc. with their CBDC. There are always ways around restrictions, especially when people that aren't deterred by illegality and jail time like me exist. It would be an arms race.
For some reason everyone wants an autocratic economy.