Fixed transaction fees in a foreign currency in an economy going through hyperinflation. That .2 USD can end up being worth more than a person's whole shopping cart (when converted to local currency)
I don't see the opportunity being missed here.
The government most probably doesn't allow it, but I'm just guessing.
I'm assuming they don't allow Zelle either, but that's not stopping people from using it.
If a Venezuelan merchant wants to accept credit cards, they'll have to work through Venezuelan payments processors and Venezuelan banks (which don't offer US bank accounts, due to sanctions). The nice thing about Zelle is they can work through a US bank (yes, surreptitiously). But that way they get dollars.