A few questions:
1. Why does Apple only take a cut of digital goods? Why the arbitrary distinction? One could argue Lyft and Uber owe their success to the App Store more than Spotify does but Apple doesn’t get a cut of their transactions.
It has to be enforceable, has a certain form of fairness as seen by users (not developers) and it has to make Apple a lot of money.
Taking money for physical things and things happening outside the iOS ecosystem would not be acceptable to Apple's customers.
2. If the App Store shouldn’t be free then why does Apple allow free apps? Why doesn’t every app cost at least .99 cents with Apple getting a cut of that sale?
It is Apple as the owner who should decide. If they want it to be free that's fine. If Apple wants the store to be expensive, that's also fine. If they want to charge only under certain circumstances, that's fine too.
Again, enforceability and acceptance is important. Taking money only when the developer is making money is easier to accept both for customers and developers.
Also a certain amount of free apps to increase the value of the ecosystem and increases the likelihood for customers to buy hardware.
3. If a friend says to me ‘man Spotify is great you really should be using it and sends me an App Store link to download it is it really Apple acquiring the customer for Spotify? And if you say yes because the app is coming from the App Store I’d say back well that’s because the App Store is the place to get it. No other app store or methods are allowed.
Let's say your friend says that a store in town sells a great brand of apples. You go to that store and buys apple. Is that store really acquiring you as a customer? Shouldn't the apple producer or your friend get all the money?
That is the point of owning a store. It doesn't matter how you got there, the store owner wants the money anyway. If you don't like the store, you can go elsewhere. Like using a different kind of device.
4. Why not allow other payment options in-app (with requiring Apple billing to be there as an option)? There are plenty of people who would stick with Apple billing because they think it’s the most secure and/or want to manage all of their subscriptions in one place.
Apple would loose billions of dollars each quarter. Most app developers, except very small one, would not include Apple billing.
Think about doing this in any kind of store. You go to a store, and there is a way not to pay the store to get the goods. It sounds quite stupid for the store owner to allow something like this.
5. Once an app is downloaded to a device is it really part of Apple’s store anymore?
It is not. The App Store rules only apply to hosting in the store. If you don't host the app in the store, the developer does not have to follow the rules for the App Store.
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You are still arguing about how things currently are with no rhyme or reason as to why they should be that way. I'll ask one more time, what justification is there for Apple to restrict how Spotify can collect payments for its services while a company like Uber can directly link to its own account signup and payment services from within the app? Why should both companies not have the same options?
The store is Apple's property and they should be able to make the rules however they see fit, yes even in the EU. Even if it hurts competition and developers and users. And especially if there are alternatives available for consumers.
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From Apple's perspective though, the distinction of business models of digital items vs. services vs. physical goods and deciding which one to force to only offer in-app payments that are subject to Apple's 30% fee for providing revenue collection and remittance services while the others can link to their own payment systems is going to be hard to justify. Why should Apple care what the source of the revenue is unless they are also a direct competitor in that market and want to more firmly entrench their market share.
It is more acceptable to customers (not developers) that Apple charge for digital goods and not physical goods. If Apple believed they had the power (long term) to charge for physical goods bought through Apple devices, they would probably do it.
So the justification is quite easy. Apple has the power to force the fee for digital goods. They do not have the power for physical goods and services.