At some point, you have to just recognize that the world is different today. The general market has accepted walled garden OSes with anti-competitive behavior towards common applications.
So its still Safari underneath it all. Much like how Internet Explorer / Edge on Windows is really just a Chrome renderer / frontend these days.
EDIT: And since Google is in charge of the Chrome renderer, Microsoft absolutely has less control over internet-APIs / Javascript APIs / CSS details than say... Apple or Google does. Which is the "monopoly" bit that we're really worried about.
When you consider which company "controls the web", its Google or Apple. Microsoft really doesn't have much control of it.