Drifting a long way off topic, but when I first started working on Aeon Timeline, Apple offered something much more valuable than that: an ecosystem of users who respected and appreciated indie developers, and an operating system who nurtured that because they understood it was something that set them apart from Microsoft. Apple’s developer tools were free when Microsoft was still charging thousands of dollars.
The App Store is something I accept I must live within rather than something I truly embrace. It probably has led to some increased market exposure for the app ecosystem in general, as it has led to more users who are reminded that “there is probably an app for that”… but it has also driven prices and perhaps quality down in the process (good apps take years to develop, and the App Store model does not encourage that investment).