The main reason is that most of the projects wanted to move from centralized version control like Subversion (used by Google Code) to distributed version control systems like Mercurial (BitBucket ...

Since 2013, Microsoft has been integrating Git into TFS, and today TFS and Visual Studio offer full support for centralized version control using TFVC and distributed version control using Git.

Today's announcement doesn't mean Microsoft is throwing in the version ... backing Git as its distributed source-code-control platform, and will continue to push TFS as its centralized source ...