Let's just say for a second there are legal issues that Apple is afraid of or whatever. That doesn't stop Apple from letting users run third-party Bitcoin wallets at their own risk without having to jailbreak their phones.
The ultimate problem with Apple is that they want to have full control over what their customers do with their devices and one of the excuses keep using is that they are "protecting their users". Really? I'm sure Apple users are a smart lot who know how to decide for themselves. It's a testament to the power of "cool" and "trendy" when people are so willing to, en masse, give up their freedom to do what they want with their devices in exchange for "being in".
Running a jailbreak is as easy as clicking a button... If users aren't smart enough to do that then Apple's concerns may be warranted. When people mess up on the iPhone it all comes back to Apple. They don't allow porn either. Their rule of thumb is: Anything that might make Apple look bad, in any way, doesn't get in the Appstore.
Apple decides what they wan't to offer in
their store - that's fair I guess.
Their software distribution monopoly isn't.
Jailbreak your devices people - it's not that hard.