NO, window's hosting usage is more as people do prefer window's just because of the easiness as Linux is difficult to follow and there are not many people who follow Linux, though Linux is the best as it is also more secure
Dude, just your site or files are hosted in the linux server, you will not be asked to use the linux operating system.
As far as I know, some people use linux and some use windows depending on their scripts or sites what they want. Some scripts doesn't support windows hosting, and some doesn't support windows.