I think I differ slightly on this stand. Africa might be a bit backwards in terms of the literacy levels, but it's still not left far behind in terms of technology and advancements. There seems to be a lot of focus on the cryptocurrencies which are the offshoots of the blockchain technology, this governments of these African countries and other developed countries for that matter are against.
As far as I know, the population of the african continent is growing very rapidly. In 10 years a lot of people will live in Africa. Yes, the overall level of literacy is low, but the active and rich highly educated individuals can invest in the crypto exchange markets enough their capitals, so I do not consider this factor an obstacle.
By the way, in some african countries people can buy crypto currencies in order to preserve their money from the hyper inflation of local fiat currencies.
I pay attention to towns and cities in these countries. For example, South Africa currently seems to be a country with an attractive investment climate.