I've interviewed with the iCloud/CloudKit teams and I'm reasonably certain that the way they dogfood it internally means that they use the same setup we do, whe

I've interviewed with the iCloud/CloudKit teams and I'm reasonably certain that the way they dogfood it internally means that they use the same setup we do, where the same ID isn't persisted across applications. People like to claim that Apple gets a free pass here but they legitimately do seem to build their apps more or less silo'd, as they should be. If you want the soundbite: if Apple tracked you across apps, their recommendation systems (be it app store or whatever) wouldn't royally suck. But they do. ;P