Great straw man you picked here.
Just because it's done in other industries, it doesn't mean it's lawful per FTC rules.
No one is saying they shouldn't take a cut from Spotify. The only point is that they should abide by the same rules with their own products, which they currently don't.
I don't get all this die-hard Apple fandom - what benefit does it bring you? Oh that's right - none at all
It's retail, whether you sell clothes, electronics, or software.
You seem to misunderstand FTC rules, or how companies sell products. There is no requirement to make the same margin on products from a third party and their own products. If Apple did, they'd probably take a greater cut than 30% on many items. Apple also takes a cut from all the third party physical products they sell, just like any company, and the percentage varies, as does the margin on their own products.
Developers and others are probably better off, because under they old way of selling a product you had, in addition to inventory costs, had a distributor and retailer taking a cut. You'd probably get 50% of the list, if you were lucky, and had to pay for you inventory costs out of that. The App store cut out inventory as well as the middleman, meaning sellers on the App store get 70% without the associated costs of building and maintaining physical inventory.
As for subscriptions, instead of paying someone like Publishers Clearing house to push subscriptions, which you sell at a cut rate to get subscribers and bear all the costs of printing and distributing, you get 70% and the marginal cost of the extra subscriber is zero. Again, Apple has made their margins much better, even with a cut.
If Spotify finds Apple's pricing unreasonable, leave the App store. My guess is the get enough subscribers outside of in app purchase to want to stay, but whine because they want all of that money.
As for fandom, I use Apple products becasue they are the lowest TCO to run my business on; if another product had a lower TCO I'd use it.
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Does Apple charge itself 15% for its own subscription purchased through its own App Store?
I’m confused. If it shuffled 15% (or didnt) around in its accounting books does it even make much difference? How would that impact the consumer (there would be no price change) or service quality change.
Companies often have internal hurdle rates that determine if a product is viable as well as pay for staff, etc. While it is a transfer payment it still has a P&L impact on the product's division. You don't make the needed margins, and your product gets dropped.