The only downside is that it’s not really supported anywhere at all yet. But I do hope it becomes a real thing some day.
AFAIK there’s a lot of talk about making GNU Taler the basis for the ‘digital Euro’ which is curently being debated at the EU Parliement.
Wait a minute. I feel like I’ve seen that one before…
Oh well, fair enough. Humankind drew heavily on Civ in its design anyway.