In addition, one lists MS. Not sure if that counts.
If you restrict yourself to contributions since Jan 1, 2020, you'll even find 4 "proper" Github employees in the top 10, and the 1 MS employee.
Another big factor contributing to it's popikaroty was that the Linux kernel (that even when git came out was a pretty big codebase already) also used it to great success.
The only real credit that can be given to GitHub in my eyes is that it allows individuals to more easily host remote repos.
GitHub launched in Feb 2008, Git soared and SVN plummeted.
https://trends.google.com/trends/explore?date=all&q=%2Fm%2F0...
No, they're just describing the new features... that does not mean GitHub actually wrote these features.
> In a previous blog post, we discussed how GitHub was using a new mode of git repack to implement our repository maintenance jobs. In Git 2.32, many of those patches were released in the open-source Git project
It looks like GH needed a better algo for git repack. Implemented a better algo for git repack. And contributed the better algo for git repack to the open source project. You can now use the better algo for git repack yourself without using GH.
It's fair to say they made the change