I highly doubt Africa cares about 5G as much as the west does. Someone will need to pay for that stuff and 5G also needs to be hooked up to a backhaul which supports 5G speeds.
China tends to offer these countries loans and even subsidies so they can build that infrastructure. Trade off is that China will control that part of that country’s operations for the foreseeable future. It’s how they came to control many ports in developing countries.