You can't purchase a Star Wars movie Blue Ray, copy it, and then resell copies, that's illegal, that's what Copyright protection means. But Disney also can't prevent you from making private copies and has no say when and where you watch that movie.
Since we're getting pedantic here: Yes, Disney can prevent you from making private copies. DVD CSS or BluRay AACS is entirely legal, both in the EU and the US. Now if those encryption systems have vulnerabilities that can be exploited for copying and as long as the copies you make are for your own private home use (i.e. you aren't going torrent or resell your unencrypted copy) then that is entirely legal, as well.
But, we're not talking about any of that.
Apps that are made for iOS are NOT Apples's IP.
No one is arguing that. The IP of Apple, the copyrightable part, is the software code running on the hardware. It's the interaction of developers code with Apple's software that is the contention point. Not that Apple owns the developers Apps or IP. The US has already established, way back in the very early 80's, that consumers own the hardware that manufactures sell to the public. For that matter, they established that anyone could develop for that hardware once it is sold to the public. This was Atari Corp. vs Activision Inc. But, the court, (and subsequent challenges) allow the development of software and hardware that can lockout code execution. Just to be clear Epic v Apple was the latest in a 40 year history of challenging this code lockout precedence. And the US Supreme Court, once again, decided to leave the precedence in place.
The US Supreme Court, obviously, does not speak for, much less bind, any part of the EU or it's members or citizens. But the EU clearly does follow suit and also allow software and hardware that can lockout code execution, otherwise we'd have seen a prohibition of such activity. Moreover, they clearly even allow complete ironfist despotic monopoly control: see video game consoles. Where the EU differs is that they've decided to say under certain circumstances -- 3rd party stores must be allowed to exist, but they've clearly not prohibited Apple from continuing with using code lockout, nor have they said that Apple can not be compensated for the use of its IP / software / hardware though these 3rd party stores.
So with that said, do you know what happened after Atari lost its lawsuit?
Here is a better analogy.
You buy a car, the car has "IP" attached to it, and you have to sign a licence agreement to use it. The terms stipulate, that you can only put gas from a certain oil company into it. You can drive to McDonalds, but not Burger King. When you go to Walmart to shop, the car company gets a cut. Would you then say, hey, that's OK, it's the car brands IP?
There are specific reasons why Apple is allowed to monopolize and dictate use of their product. But, clearly you don't care. That's fine, everyone has their own opinions. The US and EU both have very similar opinions, they just don't align with yours.
Be that as it may, even if what you hypothicise was legal -- the public has all the option in the world themself to reject that car and not drive it. There are many other cars they can choose from that don't have such restrictions or mandates. Just as app developers are more then able to embrace Andriod's ways to increase their end of the day take home pay: 3rd party app stores, (make their own app store), 3rd party payments, direct installs (sales) from the developers website to the consumers Android phone. It's not like Android doesn't have a 70-80% worldwide market share and millions more consumers, compared to Apple's 20-30%. Not to mention just have a far easier time getting apps approved (or updates approved).