Do you follow the same rule you're advocating for? When your app some day makes more than 30% margin on customers revenue, you're going to lower your prices, right?
Yes. Though since this is voluntary in the same way that having internet access is "voluntary", I'm going to say that isn't relevant here. Similarly, there is competition in the same sense that you have a choice of more than 2 parties to vote for.
> How are we to decide what number is right?
Don't know, but I do know that 30% is wrong.
If there really was competition, and this was voluntary, there would be no way they could charge 30%.
I don't know how you came to "I guess developing an app on iOS for sale at a healthy profit margin just became a fundamental human right.".
Maybe you should more carefully examine what exact market you're talking about.
The only change of pricing ever made within a decade was made because of a threat of an anti-trust lawsuit and copied word for word by Google almost instantly after that.
Safe to say that the competition is dead.
You are absolutely free to go and develop your own phone ecosystem and app store, or go provide your app development services elsewhere. That is competition. And that is what the court has found.
Competition is not that I need to give you more shelf space or a better price for selling something on my marketplace.
They don't have to allow more competition in their own store. There are other stores you can sell apps through.