You're allowed to jailbreak it and put it on there, no sweat. You're not allowed to put applications that abuse API's that weren't meant to be used by them, in

You're allowed to jailbreak it and put it on there, no sweat. You're not allowed to put applications that abuse API's that weren't meant to be used by them, in the app store, which is part of the Apple brand and, righteously so, Apple has some level of quality control for. One of the rules they make apps abide by is, don't abuse private API's. These are API's that are not (yet) ready for use by outside developers. Abusing them could leak important private data, may crash the application or the iphone when used improperly or aren't meant to be forwards compatible (meaning they'll change in the future and everything built on it is broken). It's arrogant and foolish of Tawkon to build an application on API's that are known to be private and off-limits, and then expect Apple to change the rules just for them.