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.
I don't think they are against crypto because they don't want the people to find freedom financially, but I think it's because they are fool enough to not know enough about crypto themselves

else they themselves would be investing in crypto

these corrupt politicians are so gullible. If the common people mass protest physically and the army refuses to obey these politicians orders, it would be such a nice movement