Lagos, Nigeria will be home to 88M people in 2100, Kinshasa, RDC 72M.
I don't care how bad their infrastructure is now, running fiber in such a high density populated are will always be better than relying on internet via satellite.
Despite the growth of the large cities, most African urbanization is due to villages growing past a threshold where they are statistically counted as towns (IIRC 10 000 inhabitants), and therefore as urban, though. "Greater Lagos", the coastal-urban strip running from Abidjan in the west to Port Harcourt/Douala in the east, is mostly like this: villages that grew.
* Most African population growth is still going to be outside these megacities, and even within them, only the centres will have much infrastructure, unless there is massive social change leading to institutional reform.
Edit: clarifying this, which I should have done first: The majority of the population for at least the next 40 years will be in areas with population density below about 1000 people per square km, where Starlink is viable but laid cable is expensive.[1]
1. https://caseyhandmer.wordpress.com/2019/11/02/starlink-is-a-... under the heading "Architecture".
For values of dying that include an unserved market of about 2 billion people in Africa and Asia.