That's not what I'm saying. Amazon, Facebook, Google and Netflix would be victims of this. People would still use their services, but they'd use their services through the dedicated iOS app, not through a browser. Then Apple will have become a necessary middle man for the consumption of the content that those companies distribute. And who knows what Apple would be able to get away with at that point. Charge Facebook $100mm whenever the push out an updated version of their app? All Amazon purchases must be made with ApplePay? Who knows.
This would be anti competitive as soon as the app store had a majority market share.
If it became too difficult for them "Charge Facebook $100mm" they would replace support with a lower quantity web app and blame Apple.
The reality is that Apple don't have as much interest in the web anymore, they have achieved their goal with web standards (removing enough of a dependency on Flash so they didn't have to support it). They have no need to make the web a successful app platform, so why waste effort on it.
For Google it's part of their core business, look at Angular, Closure tools, Dart, GWT etc...
Most of it comes from AdWords, i.e. Google Search. Angular, GWT, Closure, and Dart have nothing to do with it. They're also all essentially abandonware from Google's point of view, because management has rightly realized they have nothing to do with their core business.
