The world where Apple is just completely fine with Apple users paying $13 instead of $10 for a subscription if they do it through an app is an interesting one. Obviously this makes a lot of money for them but when you think about it they must think very little of their customers treating them with disrespect like this. This is how 'Tim Cook's Apple' should be remembered.
The App Store model was specifically implemented and approved by Steve Jobs. There's old internal e-mails from him complaining about Amazon's reader app making it too easy to buy books without paying the (increasingly literal) Apple Tax. In fact, the reason why antitrust lawsuits seem to never stick to Apple is because all the mens rea was stored in the mind of a guy who tried to cure his pancreatic cancer with fruit…
The difference between iOS and a game console in terms of antitrust law is "not a whole lot."
The EU has been able to get further with restricting Apple's policies because their laws and courts work a lot differently than the US courts. The EU is all about preserving an equal single market economy in every aspect of their economy. The US will let corproations do whatever they want until they are 1990s Microsoft-level dominant.