Most of African countries are still underdeveloped with limited technology in these countries in Africa. One of the major problem is internet accessibilty and affordability. Crypto will thrive very well if the problem of internet is fixed in such areas because it will generate more hob opportunities for the younger generation and boost the economy as well.
It is not only in Africa but in other developing countries as well. One of the reasons why it would be hard for cryptocurrency to be the payment option replacing fiat is that the problem of internet connection. Some areas doesn't even have electricity so it would be hard for them to use cryptocurrency. Their way to have a proper transaction is the usage of fiat because it is physical money so no need for an electricity and connection.
If you look at the developed countries, it would be easier for them to shift from fiat to digital because they have the available resources whereas for those developing countries, it would be hard to shift immediately unless there is an improvement in the technology.