It depends on the service, and a lot is the legacy of Azure actually being windows first or only for the first 5 or 6 years. I'm betting the area you were playi

It depends on the service, and a lot is the legacy of Azure actually being windows first or only for the first 5 or 6 years. I'm betting the area you were playing around in was web apps or VMs. If you look at the various container based offerings or the newer dev tools they are clearly Linux first. I'm pretty sure the new Visual Studio online offering doesn't even have a windows configuration.