It depends how you want to measure things, in US iOS has more then 50% mobile market share but Apple fanboys will use only this numbers (or how many more purchases are on Apple sore) in the conversations about how cool Apple is, when we talk about the monopoly/duopoly then world wide numbers are used, maybe throw more type of devices in there...
I would say that Apple is clearly anti-competitive, not allowing other browsers, giving their own apps access to private APIs, their own apps ignoring the users firewall and security rules etc, but judges will have to decide on this and if they still consider is legal we might need to update some laws .
IMO the society is more important then a company, so if we decide that we no longer want this bullshit we will advocate and hopefully have the issue corrected.
The Apple situation looks to me similar to when mobile providers would lock phones to their network, then charge you to unlock them, this was made illegal , if you own your phone then the unlock should be possible for free, exception is if you are still renting/paying for the device so you are not owning it fully.