The App Store guidelines prohibit trials or demo versions. Now Apple has subscriptions, which could theoretically work as trials for content delivered regularly and possibly cloud services as well, but there are no apps which, officially at least, accept money for upgrades to full versions. And since the only way you can take money is through the store, again officially, there is no way to unlock full functionality or content, except by some out-of-band means like a website. So I have no idea what TapTapSee was doing, but it was the exception and against the rules. Of course, it's Apple's store and they could implement whatever they want, and perhaps they did in this case.
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