They'll by crypto in the sense that cryptography will be used to maintain a record, but that record will be the opposite of anonymous. A government digital currency on a blockchain will allow the government to track every cent you do anything with. But it will also allow the government to limit what you can spend that money on, quite literally. It will also allow the govt to fine, tax, punish, tag, trace, follow, snoop... it will be the end of any privacy at all with regards to day-to-day life. That's not an overstatement. They'll even know which stall of a pay toilet you used and which brand of condom you bought from the vending machine. And size.