I still don't think your interpretation is warranted, but meh. Microsoft made some contributions and they're working to get them accepted upstream. They're mai

I still don't think your interpretation is warranted, but meh. Microsoft made some contributions and they're working to get them accepted upstream. They're maintaining a fork basically. GitHub is adopting their modifications, i.e. GitHub is running Microsoft's fork. Microsoft's modifications are necessary for them, particularly so they can use Git with the giant Windows repo. Presumably, GitHub also has a need or desire for those same or similar modifications. IIRC, some of GitHub's largest customers need or want a version of Git that can also handle large repos, or repos with large files or large numbers of files.