Why should they get rid of the Linux kernel?
They're GPL licenced. They're open source. They're freely available.
They're sanction proof.
But I'm glad to see you concede the point.
To achieve Microsoft freedom, you have to have 100% Microsoft free technology, from computer, operating systems, programming languages, hosting services, communication platform, social media, job platforms, the whole deal.
If Microsoft wants to stop contributing that's perfectly fine. Others will maintain it.
That's what's great about big open source projects like Linux. It's another great project originating in Europe.