Have you been paying attention to Microsoft over the past few years? They have an ugly past, but they are a different company now. I actually think this is a good thing for the community. I for one am sticking with GitHub.
Those who forget the past are condemned to repeat it - George Santayana
Microsoft lost all goodwill a long time ago, and they'll never get it back.
To name a some of their recent misbehavior: Windows 10 ads and telemetry, Skype, GPL license violation (ie still actively working against FOSS)
To me MS keeps proving they are still exactly the same company they've always been. They tend to be better at hiding it from public, I have to give them that.
Context?
It's the ol "Embrace Extend and Extinguish". I'll give it 5 years before I trust them. They'll likely show their usual colors soon enough.