What I'm thinking of is a license almost identical to the MIT and/or Apache 2.0 license, but with a clause that prohibits mega-corps from wholesale rebranding and using your code.
I have a few OSS projects myself, and help maintain a larger one, and I love the spirit of OSS, so I'm a little split on this one. But I don't really think Microsoft's actions here are truely in the spirit of OSS. Yes, the license allows it, but is it aligned with the OSS ethos? Is it "right"?
That didn't happen in this case. They took the ideas, and took his knowledge by leading him on and interviewing him for an acqui-hire.
They didn't take his code (in C#) and rewrite it in to C++.