How would you even know that? Most of the value in terms of pesos would be from a small number of wealthy people who have a very strong interest in secrecy, and are likely using VPNs and other means to shield their activities. My guess is that, for wealthy people who are somewhat tech savvy or know someone who is who they can trust, it's a very good option. Certainly better than sending relatives on a plane with $9k in USD cash to get it to a relative abroad for safe keeping.

Depends if we measure use by number of people moving, amount of currency moved, or something else.

Sounds like it's actually quite popular there now https://www.nasdaq.com/articles/economic-uncertainty-restric...

Never said it wasn’t, o just mentioned a case where it’s useful.