Earlier quoted context omitted.
None of those are meaningful contributions to existing platforms/projects that MS does not own outright. They're throwing code of the wall. MS's contributions to git are very light. Edit: clarify my point.
https://www.linuxfoundation.org/membership/members/ Microsoft has had a vested interest in Git and Open-Source for a while now.
If you need further proof, observe that Oracle is on the list. There's not a company on Earth more hostile to FLOSS than Oracle. And yet there they are, and a "platinum" member at that. Lol.