Last place I worked was all of the above and ran the jankiest proprietary server software on a swarm of Windows Server VMs for those exact reasons. There was also the reason of “how are we going to find an admin that knows both Windows and Linux around here? They’ll be impossible to replace” and while yes it was a bank serving primarily farmers in a county with less than 50,000 people, I’m still skeptical that’s a good reason to run such a messy stack