I am, for a range of applications including web APIs and background workers.
I've always favoured Linux for server apps (I used to deploy dotnet apps to Linux with Mono), but I also think Azure (and cloud in general) has, in a roundabout way, introduced a lot of .NET developers to Linux.
There's little reason not to deploy to Linux instead of Windows - it's cheaper and just a much better experience to work with for deployment and operations.
I've always favoured Linux for server apps (I used to deploy dotnet apps to Linux with Mono), but I also think Azure (and cloud in general) has, in a roundabout way, introduced a lot of .NET developers to Linux.
There's little reason not to deploy to Linux instead of Windows - it's cheaper and just a much better experience to work with for deployment and operations.