It’s a duty of trademark holder to keep an eye on potentially infringing applications and take action if it notices them. If you don’t take actions it means you have given up your trademark.
If my trademarked logo contains a red circle and you file for a trademark on your logo, which contains a green triangle, will I lose my trademark if I don't oppose yours?
No reasonable person of sound mind would ever confuse the two logos in this case.
It’s a duty of trademark holder to keep an eye on potentially infringing applications and take action if it notices them. If you don’t take actions it means you have given up your trademark.
Not sure how else Apple could proceed here.