Thank goodness that wasn't the case.
Also, the web is not even a great analogy period since it wasn't created by a private company. Apple created their phones, their App Store, they maintain it, and they provide the infrastructure for it. That's nothing like the internet.
So yes, lots of people buy iPhones exactly because if Apples iron grip.
That's incredibly disingenuous and you're either being dishonest or ignorant. The 30% is for sales made on Apple's platform. Developers can absolutely make sales without giving Apple a cut as long as they don't use Apple's infrastructure or platform. You can have people purchase things for your app as long as you don't attempt to offer in-app purchases that circumvent the App Store.