The examples you gave don't use Bitcoin; they all use USD. The currency itself is illegal; we're not even talking about what you're doing with the currency. Bitcoin's legality is disputed in China, Thailand, and the state of California. Since Apple operates out of California, it makes sense that they would hesitate to allow such functionality on their apps.

Edit for clarity: I interpret "facilitates, enables, or encourages an activity – that is not legal in all the locations in which the app is available" to mean that the act of making a Bitcoin transaction is illegal in certain jurisdictions.