Good bye old friend, you will be remembered for your start menu bloated with candy crush saga and the uninterruptible update whenever the computer felt like.
If you want to feel real madness try reinstalling Win10 from even the latest installation media, checking for updates, finding none, and then finding your computer restarted the next day with a new iteration of the Bing search box on your taskbar, and repeating this experience at least 4 times.
https://github.com/ChrisTitusTech/winutil
https://www.youtube.com/watch?v=6UQZ5oQg8XA
The defaults are not at all extreme with the knife, it takes away all the advertorial ad-ons and shows how to disable more (including Edge and defaulting to Edge from system links).
Also includes the ability to mod your own ISO to make a lean clean fast install | boot disk for later on or friends.
It's "open" if you read powershell scripts, it's literally just a pipe from a readable GIT reposity to a powershell GUI that toggles scripts that can be read by clicking on [?]'s.
If nothing else you can select the default recommended updates setting which is no new features just security updates.
I don't love having to keep a loaded gun pointed at tower and constantly being on guard with supposedly above-board software but it seems to stay down.
If you're running a version of windows that includes group policy editor, it does. Given the way windows 10+ disregards if not outright changes settings, I wouldn't exactly bet my life or my PC on it anyways.
My specific point, at any rate, was that Windows does not respect settings regarding metered connection.