In pragmatic terms, .NET is as native as anything else in Linux at this point.

You can even build it from source: https://github.com/dotnet/dotnet

In fact, the VMR ( linked above ) ONLY works on Linux at the moment with Windows and Mac support planned. So, .NET is Linux-first in some ways.

MAUI is not Linux first of course. The rest of it is becoming more and more Linux and container focussed though it seems.