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Given that the App Store doesn't let developers give users refunds, it does sound likely to me that they can't cancel user subscriptions either.

Depends how big you are. Apple has been known to give special privileges to big players like Hulu[0].

Pretty much, they also can only get a refund via Apple customer support (unless Tinder would be willing to ACH them) https://developer.apple.com/documentation/storekit/original_...