That's really interesting. I'd love to see what Apple & Nike's contract looked like. I'm assuming that Nike got some sort of cut of each Nike Watch they sold, plus a % on the bands. I wonder if Apple is giving them the same amount of $ (less per watch, but more watches) for including the watch face on all watches.
It probably makes sense to streamline the number of watches they sell, and also to expand the Nike access to all watch users.