Microsoft’s market position is reliant on Linux and access to Linux development to keep Azure competitive. Cross-platform capabilities on the .Net VM are critical to compete with the JVM and associated databases. C# has been windows-first for a while, but the core cross-platform capabilities are not going to disappear, the tooling is all CLI based/capable now, the entanglements tend to be platform and service based.

That said, F# was years ahead of C# in features C# is still chasing, and is driven mostly by the open source community. That community is more in academic and finance areas where Linux-first is common. The language is standardized and plugged into VM improvements over time.

Frankly, I see the lesser degree of entanglement with MS corporate interests as a boon for the language and its ecosystems long-term utility.