Cyberpunk connotes overcrowded cities where human life is commoditized and tech is widespread. Huge cities in Africa or India are much closer to unevenly distributed technological dystopias than the tech hubs other folks have suggested.
I guess another valid point is the problems African cities are dealing with are sort of indicative of what's projected that most mega cities will deal with in future. A huge income gap, lots of overcrowding and some kind of constant security and resource problems.