A centralized cryptocurrency is just digital currency. It may be cryptographically secured against unauthorized transfers/access, but if it doesn't employ some

A centralized cryptocurrency is just digital currency. It may be cryptographically secured against unauthorized transfers/access, but if it doesn't employ some sort of game-theory based custodial sharing scheme which is intended to incentivize decentralization of control (successfully our not), it's not using the 'crypto' protection in the special sense that cryptocurrency implies.