Unfortunately, computers and good Internet connection are really needed for the adoption of cryptocurrencies and Africa seems mainly not to be ready for that.
If a good internet connection is really needed for the adoption of crypto, then why do the citizens in some countries with an intermittent connection like the Philippines, for example, adopt and uses crypto?
it will be very difficult for some African countries to fully take advantage of the great opportunity brought by cryptocurrency and the blockchain technology due to poor internet service.
Instead of poor internet service, I'd say the reason why Africans does not use crypto is that of lack of awareness. They might not even know what bitcoin is.