This argument always intrigued me. Once you point out cryptocurrencies don’t actually solve the unbanked problem for poor people, then the use case immediately shifts to “well have you tried to move seven figures between countries”?

By the way many African countries have a robust mobile phone based banking infrastructure. Nothing to do with cryptocurrency. See https://qz.com/africa/2161960/gsma-70-percent-of-the-worlds-... for example.