> Then, for 14 years, tons of money was dumped into it, and not much happened. It's still mainly used for black market goods. It still has terrible user interface. The transaction rate is still low. The transaction fees are high. And, it's too easy to have your coins stolen.

I agree that, in the case of Bitcoin specifically, it's still primarily used for black market goods (excluding speculation, of course), among relatively wealthy developed market users. However, there are a non-trivial number of genuine users among economies with less stable banking systems, as the OP points out. And it isn't true that fees are still high and tx rate is still low, the lightning network solves that problem. It hasn't seen super widespread adoption yet, but the technical problem, as far as fees and transaction rates, is essentially solved. What you are correct about though is that the UX is still pretty terrible for the average person. However, in some places, that UX is a better alternative than the one they have access to locally.