Perhaps there was some hyperbole in my statement, a more measured statement would be: I suspect that the more modern alternatives to TFS are perhaps starting to

Perhaps there was some hyperbole in my statement, a more measured statement would be: I suspect that the more modern alternatives to TFS are perhaps starting to create a dent in the TFS cash cow, and M$ are hedging their position. Perhaps with an end goal of some interoperability, or full scale integration of github into TFS over time. Obviously this is all speculation, only M$ knows why they did it, but it seems like a good bet if they want to be providers of SaaS solutions and one of their existing solutions is under threat.