I think that the issue here is that every person and their grandma has an iphone, and so they are a bigger target. Pretty much every single person in the western world has a mobile phone, and the majority of those are iPhones.
No matter how hard you try to compare this to the console market, its apples and oranges. The amount of xboxes sold and the market they are sold to just pales in insignificance compared to Apples domination of the world.
Also the gaming world has a much shittier nemesis, gambling. The loot box and microtransaction scandals have overshadowed any issues with store fees. I feel if these things hadnt been so big over the last decade, there would have been much more focus on the payment issues of app stores.
As a kicker, I feel that the courts would probably argue that the console world is very specific to gaming, and therefore is a much more targetted audience. Phones have apps for everrything that run your life, hell you cant even get a bus ticket or do any banking where Im from if you dont have a smart phone. So it is much more of a lifestyle device which is required to live in the modern age, whereas consoles are purely entertainment.