Let's say I like C# and I also like Linux. Doesn't them making C# (and .Net) open source and cross-platform enhance my freedom to compute how I wish?
Or is that somehow different from other open source languages, like Python or Rust? How do those help with computing ethically?
Why do you need this on Linux? Only to integrate with MS proprietary products, that's why.
This means that when I'm writing a website or a Docker microservice, I want to use C#. And since the best OS to run those is Linux, there are no proprietary MS products in sight.
When I'm writing a cross-platform desktop application, I want to use C# too, but I can't, so I'll use another language.