and so who controls that crypto? The biggest country of the group? Or the wealthiest? What happens if one of the countries needs to print some money to get out

and so who controls that crypto? The biggest country of the group? Or the wealthiest? What happens if one of the countries needs to print some money to get out of a bind? What happens if external countries don't want to receive the crypto in exchange for imports/exports? I dont think crypto makes any of the above any better than an existing currency owned by the fiat banking system.