Linux is only used for Java based backends, when deploying into production.
With .NET deployments being done on IIS, even with .NET Core.
Some of the designers are using Photoshop on macOS.
Anecdote data.
Linux isn't just a distribution platform, it's also sensibly a development platform. I rather work on the system I'm building for if and when possible.
Edit:
I use .NET Core and while I have done it from Windows most of my time in the past few months, I also do code in .NET Core from Mac and Ubuntu (more Ubuntu than Mac). It works good enough so long as you use Visual Studio Code for debugging.
Will confess that most of it is scientific applications for the science and modeling team, which runs a mix, leaning towards Mac and Linux for... reasons, so dev work on Linux is better suited.
The "Business" side of the house uses C# and IIS on Windows.
Admin use Windows, Mac is rare.
I find it strange, in this day and age, being forced to use a single OS because "policy", especially when developing for an "open platform".