Of all people, Microsoft could do it. They have before. A Windows X with a appstore only would be a trivial variant for them.
Either way, it’s irrelevant to the parent comment: if you agree to the terms, they willfully defy them... well, you’re violating your commercial agreement.
What next, I sue amazon for discontinuing my AWS services when I start running spambots on it or some other willfull violation of their avceptable use policy [1]?
Its ridiculous.
The only ones winning here are lawyers.
[1] - yes, they do have one, and you will get suspended if you violate it. https://aws.amazon.com/aup/
Early market movers have an advantage and that will keep growing.
Another reason why many hospital systems, military, etc department pays microsoft to support XP. Those OS aren't "better". Most people using them won't choose them over windows 10 or Mac if given the option.
Windows Phone was already reaching 10% mark when they gave up, and were the Android alternative to many Europeans.
The proof being that in what concerns tablets, most people around here not carrying iPads, are carrying 2-1 Windows laptops with detachable keyboards, not Android tablets.
You have open source Android or Linux to start with.
As long as Linux can be installed on desktops you technically have a choice.