I'm with Spotify on this. There should be no reason Apple should be taking 30% of Spotify's subscription fees. The same goes for any subscription service that isn't leveraging Apple's own developed apps. If Spotify wanted to charge a fee to buy their iOS client, Apple can get their cut. If Apple allowed Spotify to somehow allow customers to use Apple's Music app, Apple should get a cut. 30% is excessive and should be drastically reduced.
I think everyone fails to understand how this works, and why it's so much.
1) Apple created the platform (AppStore)
2) They created an EASY way to purchase (renewals/subscriptions) via this store for ALL the apps that need it.
3) Customers (You and Me) don't have to worry about the apps being "Safe" or correct or anything like that.
4) You deal with Apple if something is wrong on ANY app purchase.
5) Apple has wide reach GLOBALLY. Big platform (Store if you will). Everyone gets to see your app IMMEDIATELY.
6) A physical store would upcharge to sell any item it has. This is no different.
7) You can just have an app on the store that requires an account to use. But, you have to do the activation outside of the app.
8) 30% cut maybe high, I don't know. But, it's not like that doesn't get them anything. So it should be an argument over price.
They could just be a web app or something, and for-go the appstore. But, they know there is money to be made on the platform.
So, they have a choice and ways around if they want to use it. It's not as clean and convenient. But, that's what 30% gets you.
Spotify didn't make the AppStore. Apple did, just like Googles PlayStore etc. There is a cost to selling any product in any store.
Just like if you go to a grocery store. They don't all carry the same thing every other store carries. Most things, yes. But, one store will carry something the other doesn't. Or even for different prices, sales etc.