Forget Dangote and the rest of the billionaires, the richest people in Africa are politicians. Africans need to reevaluate and rethink their system, so much power is given to the politicians and without any checks or balances.
This is true for most part of the under-developed countries around the world. The politicians in these countries misuse their powers and keep their country men as they were the king and the public are their slaves. These people will never let crypto grow in their country because they don't want people to get financial freedom.
Due to a high degree of privacy, the penetration of crypto still relatively good in African countries but the receptive ability of people in these countries is so difficult when the politicians have gathered all their power and turned the lower classes into slaves as you say, very few people can break through this siege. Social class discrimination and the power of the political apparatus all made Africa the continent with the most poverty, it is difficult to solve when the politicians here do not allow the absorption of new advantages, they bind people within the old framework.