Windows 10 has the option of specifying that a specific network is a metered connection. It won't update the OS when connected to those networks. Found this out the hard way after getting a big bill while traveling and tethering to my phone's 4G connection.
Good idea thanks. We'll check it out. But of course again, that's not something the user should have to do (and not something we want to have to do on every single system that connects). Wifi != "unlimited bandwidth."