Use of HCQ is only one of the reasons that Africa had far less problems with COVID-19 than most of the world. Two other major reasons are an extremely young population and little obesity.
There’s also the routine use of Ivermectin to prevent African River Blindness.
Africa and Ivermectin
https://archive.is/2021.08.28-042601/https://threadreaderapp.com/thread/1431339779703017477.html
The infographic there is excellent. Summary: The parts of Africa where Ivermectin is in widespread use to prevent a terrible parasitic disease, African River Blindness, also have very low Covid incidence.
Why does Africa have an extremely young population ?