Safari may also be facing the same issues; even before this, the rules about browsers in iOS were (to my non-lawyer eyes) suspiciously similar in market impact to Microsoft's Internet Explorer in Windows 95, for which they got in trouble.

https://en.wikipedia.org/wiki/United_States_v._Microsoft_Cor....

But Edge will not be the only alternative; Firefox does still exist, and the Chromium project has forked into several other browsers besides Edge.