On ARM chips, Microsoft gives IE access special APIs absolutely necessary for building a modern browser that it won’t give to other browsers so there’s no way another browser can possibly compete with IE in terms of features or performance.
In other words, Microsoft is setting policies for Windows for ARM that are a lot like Apple’s policies for iOS. These policies and restrictions make just as much sense for Microsoft as they do for Apple.
I can never understand people who have the mind of “that’s fine, it’s better for the parent company.” It’s also worse for the user. The policy that Apple has for the iOS store is just as bonkers.