Objectivism isn't correct, here. You are comparing a captive audience with zero internal competition to three competing platforms, all that set their pricing in accordance with their competition. Apple has no competitive pressure, therefore comparing their pricing to competing stores is rationally nonsense.
The rates on PSN, Steam and Google Play Store are "standard" because they have competitors that hold that price accountable. Apple does not. If you cannot see the anticompetitive harm there then I don't know what to say to you besides "better prepare your 401k for the worst".
If the Google Play Store and the Apple App Store have the same fee structure, and your argument is that Google got their through competitive pricing… how can you claim Apple is taking advantage of their position when there is no price gouging going on when compared to other platforms that are offering the exact same service on another platform?
The rates on PSN, Steam and Google Play Store are "standard" because they have competitors that hold that price accountable. Apple does not. If you cannot see the anticompetitive harm there then I don't know what to say to you besides "better prepare your 401k for the worst".