You don't need to convince me that Swift is poorly positioned there, but if you only care about server side (or possibly CLI) apps, the usable ecosystem on Linux isn't too shabby.

Does it make sense compared to C#, Go, Rust or a JVM language? I don't know, but it's there, and Apple put some resources behind the initiative.

I think it is comparable to C#, at least C# a decade or more ago. Back then it was a great language for developing GUI applications on Windows, Unity games, and that's about it. Now there's a blossoming community of cross-platform frameworks, but only because Microsoft invested in making those first-class. Apple hasn't been putting that effort into Swift.