Notice how many languages DevDiv supports nowadays, see languages dropdown on https://devblogs.microsoft.com.
Thus even .NET has to fight for internal relevance, most Azure contributions to CNCF are in Go and Rust, they even have a "Rust for C#/.NET Developers" (https://microsoft.github.io/rust-for-dotnet-devs/latest) tutorial.
Azure is also mostly doing Azure Linux nowadays, even if Azure Host OS is still Windows based.