There is an easy fix for Spotify. Make their app available in their own App Store that they run and develop.
But apple doesn't let others run iOS app stores. Apple has a monopoly on them.
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Everyone has to pay 30%, not only Spotify. It's literally the same rule for everybody. But sure, Apple can pay itself 30% of the Apple Music revenue
- "First, apps should be able to compete fairly on the merits, and not based on who owns the App Store. We should all be subject to the same fair set of rules and restrictions—including Apple"
If you want your service to be on iOS you have to play by App Store rules. It's just that simple. If they don't like it they should become an Android exclusive or just stop offering the subscription via IAP - I personally wouldn't care.
Apple's iOS app store rules do not override the laws of europe. If apple wants to sell apps in Europe, they have play by the rules of that country.