When you are financially poor, money that comes in must, essentially, instantly go out (i.e., there are expenses, purchases, or debts where those funds received will be used).

It's the same everywhere in the world where the poor are, but in most of Africa, being financially poor is the norm, not the exception.

Thus integration where spending bitcoin to pay in fiat is necessary, otherwise the bitcoin earned (or bought) is limited (or useless) to those who do not save and are not in a financial position to where saving in bitcoin is an option. When there is wider acceptance of bitcoin by individuals, merchants, and lenders, then at that point funds received can be turned around and spent immediately. But today, there's a wide gap between when bitcoin comes in and the ability to use it for spending that would otherwise be done in fiat funds.