I completely agree with your observation, but I'm not sure what is the point that you're trying to make here :-). F# is open-source and has a very active community that is contributing to many core parts - including the tooling (http://fsprojects.github.io/VisualFSharpPowerTools/ and http://fsharp.github.io/FAKE/), the compiler now also accepts contributions and there are a few work-in-progress pull requests, as well as building some of the core F# libraries, e.g. for data science (http://fsharp.github.io/FSharp.Data/, http://bluemountaincapital.github.io/Deedle/, etc.)

I think the F# community is much more like the "open source" model than the "closed MS model". The change is slowly happening in the rest of .NET, but F# is way ahead here.