Derek Powazek talks about the burden that the app store approval process puts on iOS developers:

Apple’s App Store was a constant source of stress in the development process. Every time another story of Apple randomly booting an app from the store came out, the whole team quaked. The idea that we could do all this work and then Apple could deny the app, or even keep it in limbo forever, made us second- or third-guess every design decision. “Will this pixel hurt our chances of getting accepted?”