Everything here you accuse Google of doing, Apple is running circles on. Ultimately, if this case goes through Google are right about one thing. The UX on Chrome is going to take a steep nose dive.
Even for the matter of the browser, Apple does not have the same push as Google does. Yes, Safari is the default browser on a phone. But outside of the mobile world, Safari is a rounding error.
No, but they're trying to: https://news.ycombinator.com/item?id=42185080
In order to dive any further, it would have to begin excavation.
This article accurately captures all tech monopolies, Apple included.
Probably worse so as Google don't seem to copy the features of companies and then spin them as their own all the time like Apple gets away with. Or to kill/remove/restrict competing apps when Apple decides to get into the market for something, or just generally as a "punishment" for not following Apple's strict rules (that only exist to benefit Apple, whilst they tell consumers "it's all 4 u baby").
I don't do web dev, but from what I've heard, web devs also suffered trying to support multiple conflicting browsers, and Chrome's dominance actually makes life much easier.