Not only in Africa but almost every part of the world, everyone is feeling geek about bitcoin and want to be identified with such technology because it's a decentralized one, but africa is just oppotuned to be among the fast growing continents with bitcoin adoption.
You don't need to always have money before you can have bitcoin, there are many ways to get bitcoin,one is to exchange it with fiat, another is to earn it, while you can also receive it as gift from someone, since it's a currency, it is more convenient for one to earn it by creating or providing a service which is your value, and receiving bitcoin for payment for such services rendered.