Quote:
Originally Posted by brentajones
The App Store doesn't allow trial versions. Your app may have slipped through the vetting process, but they seem to be breaking the rules.
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Sorry for the misunderstanding. The app as a whole isn't a trial. It remains available. However, its key features are subject to a time-limited trial. An in-app purchase switches the features from trial to pro.
If you are interested, the app implementing the above behaviour is called MLO 2.
Also, there are numerous apps available in the App Store designed to present ads. They often provide an in-app purchase to disable ads.