I'm not sure how one can come to any conclusion. It's just as likely that it was an oversight as it was a misunderstanding. Although I would say it's unlikely that anyone sat back and said, "Let's not pay for this image right here." Apples imagery budget has to be astronomical. Even if the artist were asking exorbitant rates for that photo, it wouldn't make sense for Apple to use it without licensing it. The risks are too high. They'll pay much more now.