It's not guaranteed, but one realistic outcome is that its IAP services get worse, because e.g. automatically saying yes to all refund requests is less feasible

It's not guaranteed, but one realistic outcome is that its IAP services get worse, because e.g. automatically saying yes to all refund requests is less feasible when margins are thinner. Retailers like large supermarket chains are only able to have no-questions-asked refund policies because nobody is actually taking a bad box of cereal back to a store, but in digital, it might too easy right now for a 3% cut + absorbing chargebacks to be sustainable. Similarly, having cancellation be one-click and done is great for the consumer but if you're in the razor thin margins game unfortunately making unsubscribing difficult is a competitive edge. IAPs are only indirectly a product that app customers get a choice in; the primary customer is app developers who have vastly different interests. There may have to be a shift on some of these axes for Apple to compete on price.