Microsoft's "acceptance of open-source" only stretches as far as it helps them survive, in an economy where "why would I buy your product when there's this open-source thing" is a question that gets asked more and more frequently. You know, the "embrace" and "extend" phases of "embrace, extend, extinguish".

This is really obvious from the parts that they choose not to open-source, such as https://github.com/MicrosoftDocs/intellicode/issues/201

Nat might still hold the CEO title, but no longer has the power to set policy.

He should do as he is told by MS.