Anywhere people are unbanked. If you're not part of the system, then there is no system to get around.

Nomads are often unbanked too. When I was living in Vietnam for years, I was certainly under US laws and I obviously have to pay my taxes and follow Vietnam laws.

But, as a foreigner (especially one who doesn't speak the language), I'm still quite outside of the system there. If you've ever been a nomad, you'll understand that difference.