Why there is no Windows 365?

I mean a subscription model for Windows, just like Office 365. I don't know how to implement a Windows subscription model for devices that have Windows pre-installed. But at least Microsoft should try it out for desktop PCs. I think this makes sense particularly since Windows seems to be moving to incremental updates instead of major ones.

What do you think? Please comment whether you are an Office 365 user or an Office 2013 user. Also, would you like to switch to a subscription model for Windows?