Cryptocurrency is a threat to the central banks in one other way:

• Total global debt is a bomb waiting to be triggered.

When total debt-- global as well as national-- reaches a point where governments don't have the ability to keep th currency solvent, it's just a matter of time before they must declare bankruptcy. People know this, and people see this. Cryptocurrency gives people an alternative tool for carrying out daily transactions.

People fleeing fiat currncies will also flee CBDCs. However, governments will force CBDCs on their populations, so it won't be a pretty situation.