Earlier quoted context omitted.
> I don't think Apple is terribly interested in market share for Safari Google pays Apple $20B a year because of the market share Safari has on iOS. I'd call that "interest" That's 10% of their turnover (and likely mostly pure profit, as they seem to spend a fraction of that on Safari)
Try again. Anyone can write a browser that uses the existing web engine and connect it to any search engine they want. Make it popular enough, and they can made a deal with Google. Having Safari is a default browser is another (valid) issue, but that is a separate concern from the web engine.
The browser engine is an important piece of the puzzle when it comes to getting people to switch browsers. If a site works faster or better on browser B, that's a reason to switch.
If Apple's WebKit engine doesn't allow you to do video calls, you could build that into your engine and actually compete.
Why would Google and Mozilla spend millions on developing and maintaining their own engines if they didn't think that it provides value, e.g. a competitive edge?
[1] In the past, Safari did get some features that other browsers on iOS didn't get, e.g. Being the default browser (you couldn't set Chrome or any other browser as the default until iOS 14(!), Nitro JIT (Safari was significantly faster than other browsers on iOS for 4 yrs), camera and microphone access (video calls only worked in Safari), Web Extensions, Apple Pay, Fullscreen API, Add to Home Screen (ironically)...