You don't know that. Apple has rejected apps it didn't like before even though they didn't violate any of the review guidelines, like e.g.
Launcher.
Exactly which contractual agreement was that?
I don't trust any company. But I don't really care that much in this case since credit card numbers are not really that critical. When one of my cards is compromised, I file a dispute with my bank, any fraudulent charges are removed, and I have a replacement within a few days. No big deal. Just don't use a debit card since they can cause more hassle.
[doublepost=1467603975][/doublepost]The problem is that this also puts Spotify at a competitive disadvantage since it increases friction for potential customers, particularly since Apple does not allow any kind of link to an external sign-up page. And now we learn that developers apparently can't even mention that a discounted trial offer exists without providing a link (which is what Spotify did in the rejected app version).