Doesn't surprise me, honestly. Most devs either target Linux for backend stuff, develop for web or Android in terms of frontend (which works just as well on Linux), or could at least benefit from their application building and running on their CI/CD Linux server.
And once your application runs on Linux, you only need the dev stack to do the same, which probably works better on Linux than Windows already.
With macOS, unless you're extremely specialized in graphics work, iOS or macOS development, chances are you can't run all dev tooling or the application you're developing without jumping through hoops.