I can't use Safari on my HP Linux laptop and on my Android phone. Apple doesn't make it for those OSes. That's a choice like any other one. What I don't like is that deny other companies to run their own browser engines on iOS. They have to reskin Safari. Luckily this is going to change soon at least in the EU.
Isn't Safari by existing at whatever market share still a counterexample to Chrome being a monopoly?