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The thing about the car being a bad investment and Africans being smart and not buying is pure BS.
They can't afford one , they can't afford gas , there is no gas .. there is nothing.
Ever been to the slums of a capital city in any of the country mentioned?
A cheap Hollywood movie about zombies is pure paradise compared to the reality there.
How the hell can you think about online payments when 15% of people have access to electricity.
You have seen the emoji, haven't you? (But in my opinion, the sentence is not a pure joke - cars are overrated. You can agree or not.)
And sorry, your sentence about the zombie movie is a great exaggeration. I've been in some Latin American slums and African slums are not really different. Living there is not easy. But most people there even have (cheap) smartphones and could use Bitcoin if there was an app for it, and if it was more stable.
The people excluded in third-world countries are more so those living in the countryside, as there often there are very bad internet connections. But even there some use financial mobile apps, e.g. to know the prices for the agricultural goods they produce.