I think Dan has an interesting point of view. Many startups are born through exploiting interesting new technologies or opportunities within an ecosystem. However, it does seem that Apple is making that increasingly hard to do. They want to ensure that you're locked into their platform completely.

To me, the iPhone as a platform is becomingly potentially more dangerous to make a living on. The application approval process has become increasingly arbitrary and it would really suck to lose your means of living because Apple decided they didn't like something you did.