My update was reject with this explanation
> Your app displays apps, other than your own, for purchase or
> promotion. This is not in compliance with the App Store Review
> Specifically, your app contains a section that includes 3rd-party apps
> from other developers. The attached screenshot has been provided to
> help show this issue.
> It would be appropriate to remove this feature from your app to be in
> compliance with the App Store Review Guidelines.
I was using Admob and it was approved. Admob decided to stop serving ads to my app so I switched to StartApp with this new update. Does Apple not allow Interstitial ads now?