Yes, I did know all that. I also happen to live in Africa quite frequently as I am South African. I also know people from all over Africa - including Nigerians.
There are very rich people in these countries, and they are the one's buying the coins. This does NOT mean that the poor people are benefiting through them. They aren't. They are being scammed though.
Mostly they are illiterate and they can hardly read and probably make $1 a day. How is it that they are going to benefit from Bitcoin. I bet you've never set foot in any of these countries, whereas I have spent many years living in several of them.
You know absolutely nothing about Africa whereas I was born and bred there.