> Apple don't stand to profit from making Safari the default/only browser on iOS.

Yes, it does: it sells placement on that browser, since it is the default browser.

And that's billions of dollars per year.

> Apple don't have a dominant position in the smartphone market

Apple has 100% market share in the "proprietary mobile operating system", just as Android has 100% market share on the "licensable mobile operating system".

Those are the market definitions the EC used to assess the case, not "the whole mobile operating system market".

Get you facts minimally straight :)