I think this is an amazing move for Microsoft. If they get the kinks worked out and get it working well on Windows Server, they'll have one platform that can run pretty much all the major enterprise software without virtualization. That's great; it's a way for Linux shops to convert to Windows Server without having to fully commit right away, because they'll still be able to quite easily run their existing stack and leverage their developers who are used to Linux tooling.
Why is that good though; why would Linux shops want to convert? In the space I work in companies (including enterprises) like the fact they can do whatever with the source code and that they can audit whatever part they want. MS has that too but not for many clients and you cannot do whatever with it. The freedom in Linux means a lot to a lot of people even if you maybe could get a bit more perf or support from a paid platform. We have people working with VS (a few only) and because of our tooling it works smoothly anyway. I have no clue why you would switch to something paid and closed...
