Comment by pxc

It mostly goes the other way, I think. The community surveys haven't asked about NixOS desktop usage in particular. Still, I'm certain that a large majority of contributors are running NixOS on their desktops/laptops/workstations.

That said there are prolific and longstanding contributors who focus on non-NixOS and even non-Linux platforms, and corporate users are likely to be running Nix on macOS or Ubuntu (under WSL). It's not surprising that some users who don't use NixOS on laptops or desktops have still become Nixpkgs contributors or maintainers, imo.