Hi Jamal! Thanks for the mentioning
I've spent 3+ years in Eastern and Southern Africa by now and there's lots to adventure and see!
But in regards to Digital Nomads I can only recommend Cape Town at the moment.
No question, there are lots of startups across mayor cities like Johannesburg, Gabarone (Botswana), Windhoek (Namibia), Nairobi (Kenya) and Kampala (Uganda) but there isn't any kind of DN scene yet.
Mobile internet is the best in the world. There's 3G literally everywhere where there are more than 500 people living close to a main road. I've been traveling across the continent 5 years ago and had always a sim with 3G. Yes there are still some blank spots, but hey, this place is massive and vast and it's quite a mission to put up towers across if there are no customers.
And now the mayor cities have upped with 4G too. When I was back in Kenya I had to exchange my old sim to get the 4G one.
Right now I'm in Cape Town using an LTE router and get 8mbs up/down. There is also a Digital Nomad Facebook group here and lots of cowork options (like 25 spaces).
Nomadic Entrepreneur. Founder of (Supporting Education in Kenya) & (Digital Nomad Network Safari in Southern + Eastern Africa)