False equivalency. What you're saying is that Apple should be allowed to profit off a service they're not providing.
Apple gives you the app. Spotify provides the service. If Apple wants to make money off the app, they're free to do so. They're hosting it, they're advertising it, they're acting a store front for it. But what is Apple doing to make Spotify's service better?
As I said, it's like Walmart taking a cut of AT&T's monthly fees because someone bought a smartphone from their store. Just because a store acted as a gateway to a service doesn't entitle them to a 30% cut of another company's monthly income, not unless they're supporting it in some way.
What someone is entitled to is up to the parties involved, not someone on a forum.
If someone is in the Apple App Store, then your statement above is false. Apple is acting as the storefront, not Spotify. What does Best Buy or Walmart do to any product it sells to make it better. Nothing, other than they offer convenience, and they get a profit for it. There are going to be people that want the convenience of having their subscriptions centralized into the Apple ecosystem.... less things to worry about and one place to go. I'm not one of them. But if someone is willing to pay more for that service, then its there for them. The irony of this whole thread is that Spotify charges more to go through the App Store, so guessing few people don't subscribe directly with Spotify. Netflix charges the same as far as I know, so they make less on App Store subscribers.
I will also say that having run subscriber based web hosting and dealing with credit card expirations and such, I can tell you there is definitely a cost involved in maintaining the subscriber base. Frankly, for Spotify to be able to hand that off to Apple, they would probably have more sticky subscribers because its not a one off subscription that missed getting updated with new credit card info. Very few people are going to let their Apple credit card info get stale. Spotify, in my opinion, is in the wrong for trying to charge more to subscribers going through Apple.
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Yeah, they can, which just goes to show you how useless Apple's rule is.
So then why is Spotify complaining other than to get media buzz and additional sales?