China issued a stable coin about five years ago. It is used for all retail payments (I believe, small value, payments for govt employee salaries, etc). Somewhat bizarrely, it is significantly more privacy-protecting than payments in the West.

Quite funny to read comments from people asking what use is crypto. Can tell they have probably never left West Virgina.

Don't think it would be that useful for Iran though as they are already RMB earners, and RMB financial markets are still a bit questionable (there is depth, I don't think anyone knows why this depth exists or what it is actually for, just state-linked banks moving paper between themselves furiously).