I wouldnt trust this data that much. I recently noticed many github accounts which only seem to contain solutions for exercises in a programming courses, iirc most from from india. This seems to match this survey. My 2 cts, probably this just shows countries where schools prefer to use github over their own infrastructure, or else students being creative in sharing their solutions outside of school.
Also there's been an increase in ChatGPT spam comments on GitHub.[0] The goal seems to be faking account activity to make the accounts seem legit, so I wouldn't trust active user numbers too much.
[0]: https://github.com/orgs/community/discussions/37117#discussi...