An article entitled "Why Apple is Afraid of Bitcoin" discusses Apple's interest in online payments. It also talks about the removal of 2 Bitcoin apps, Blockchain Wallet and BitPak, from the appstore.
The explanation given by Apple was that “apps must comply with all legal requirements in any location where they are made available to users.” Apple further stated, “it is the developer’s obligation to understand and conform to all local laws” and the developer was referred to the legal department for an exact explanation of which law it violates. Clearly, they will not be able to cite a law as no laws prohibiting bitcoin currently exist in any jurisdiction.
Though the author of the article claims that no laws prohibit Bitcoin, Apple obviously disagrees but was very unhelpful in explaining which law it might be referring to. Has Apple discussed its stance regarding legality of apps using Bitcoin or other alternative payment systems?