This behaviour doesn't become ethical just because you agree with what they are pushing for. What they're doing is wrong, even if their end goal isn't a state which is in and of itself wrong.
I don't really view that sort of thing as ethical or unethical. Of all the evils in the world... I wouldn't even call that an evil at all, not even on the list.
I genuinely agree and believe that Edge is in the best interests of Windows users, and while less so because it's non-native, also users on most platforms that they support. When they say, "the internet is better with Edge", it's actually true this time.
