Most of their population don't have access to bank accounts, and bitcoin can help here. Their coins are usually poor, and have no economic power
They don't have access to bank accounts, how do you expect these people to use bitcoin when they get to know on how banks work,crypto will be too much for them, for, one at least 25% of the population in Africa are illiterate ; two, they don't have adequate facilities (some don't even have basic needs and necessities); three, the markets of crypto are too volatile for them to handle and all these will affect the people tremendously.
I would not say that yet until sure. I totally agree with you on the fact that a very good number of the populations are illiterates which of course exempt those categories of people.
The infrastructures needed like internet is also not that widespread in some part of Africa, but at least doing well in parts where the OP have mentioned which would make those areas adopt faster than the others. I was in South Africa and Nigeria recently, and I was amazed at the rate some of them have adopted the use of cryptocurrencies and that even reassured me that crypto is here to stay.