Hard to believe but I suppose it is possible its a simple mistake.
Its particularly rich that a hyper IP-conscious company like Apple would commit such an obvious and high key infringement.
I suppose it could be an honest mistake, but I have to admit that as a photographer who has had multiple photos taken and blatantly used commercially without my authorization or knowledge by a large international company, its hard for me (given my past) to not get rather upset at a situation like this. Because they do know better.
My situation was lower key, and I simply asked them to cease and desist and never asked for money. They eventually did after claiming first that:
1. They could use anything they wanted that they found off of the net
2. That I didn't have a copyright on the photos
3. That their usage wasn't commercial
All claims that were patently (forgive the pun) false. It was used as advertising for chrissakes.
Looking back at the incident now, I should have just invoiced them ('Nothing personal, its simply business, I hope you understand.' ) and then followed up with a lawsuit for bad faith infringement if they didn't pay - because the damage was done as soon as I took issue with the infringement. Foolishly I thought that by being reasonable and trying to work things out professionally we could reach a mutually agreeable outcome.
Every individual and company is different. There are some real slimeballs out there. Watch your step.