This question can be answered more authoritatively by the MLH and GitHub Education folks, but this snippet from the the GitHub Education blog postmight help provide an answer:
Students receive a stipend for the program through GitHub Sponsors, allowing us to serve 32 regions and counting.
Because it's a paid internship program, there might be complexities around handling payments that the GitHub Sponsors team is still working through as they add more countries and regions.
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All/Most of the African countries are missing. Is there a reason why??
This question can be answered more authoritatively by the MLH and GitHub Education folks, but this snippet from the the GitHub Education blog post might help provide an answer:
Because it's a paid internship program, there might be complexities around handling payments that the GitHub Sponsors team is still working through as they add more countries and regions.