Bitcoin has a similar issue with the telephone. Quite useful, except when almost nobody else has one. If they make a passable CBDC legal, and the rest illegal, what will the masses do?
Also, stamping out coins, I dunno, you say they go underground, maybe, maybe not. A country size surveillance system used to hunt down miners/users would severely cripple most coins.
And while books get their value from the information inside, cryptocoins get their value largely from the (now nonexistent) free and open market they are used in.
I suppose this is an addition to my earlier "value of a coin" claim. The mining cost is involved, but the utility comes from being easier to use than cash, and bypassing banks.
