Travel out of a city in South Africa and you will realise that few outside of cities have an internet connection. According to this, only 60% of SA have a connection. That unconnected 30% live in a vast area that would cost a fortune to connect without satellites::
Exploring the world’s progress towards universal internet connectivity, and taking a closer look at the barriers that are slowing that progress across LMICs.
datareportal.com
It was the latest coverage I could find. The last coverage map I could find on MyBB for SA was 2014.