Devs need to increase their prices to make a living to account for the 30% Apple tax. Higher prices hurt the consumers who do not want to pay that and shouldn't as the app developers do not even want their customers to pay that. Apple made it so, so it's hurting the customers.
Then again higher prices usually leads to less demand, hurting the devs even more (who will have to either eat the losses, or increase prices even more; goto 1). Apple made it so, so it's hurting the developers.
So Apple is hurting both, customers and developers.
But are app customers also Apple customers? Well, customers give a ton of money to Apple directly. It is comparable to a brick and mortar store where the customer does not actually pay the store, but the landlord of real estate in which the store is housed, who then keeps 30% and kicks over the rest to the actual store owner. And then the landlord claims it has no relationship whatsoever with those customers. Sounds ridiculous to me. Imagine credit card companies said they will no longer do any fraud prevention let alone fraud compensation because because all the money exchanged it between the customer and the vendor (or fraudster).
But it even goes further than this: said hypothetical brick and mortar store is in a company town, so all estate in the town is owned by the same landlord (the company in "company town"). Neither the store owner nor the customers have alternatives to do business in that town without the landlord's involvement. "But you can always move" says the landlord (i.e buy a non-iPhone as a customers and switch to another platform such as Android as a developer)...
Now the question is whether the court will find Apple is abusing their monopoly on "iOS App Stores" or if they are well within their right, because they do not actually have a monopoly as there is more than just iPhones and their App Store in the market.