zlacker

iPhone market share in the UK and US is a little over 50%, but in some demographics significantly higher.

The point is though, you can't install an alternative browser engine on iOS, you could on windows. So it's a bit of an Apples to Oranges of a comparison (no pun intended).

There is clear anti-competitive behaviour, even if they aren't a "true monopoly".

>>samwil+(OP)
Not all anti-competitive acts are illegal, nor should they be. Building a sustainable competitive advantage is business school 101 for 60 years. Vertical or horizontal restraints are typically evaluated case by case based on whether the actor is a monopoly.