It’s not just about hosting, they also provide basically the entire software stack you’re using. Pricing that is difficult but I don’t think it should be disregarded.
> but can you even name one example in the past 5 years (literally about half the life of the ecosystem) where the App Store promoted an indie developer into success?
There are tons of apps that got popular due to App Store editors choosing to promote them. For example, getting App of the Day nets you a 1700% boost in downloads: https://techcrunch.com/2017/10/24/apples-app-of-the-day-feat...