You're right, app contracts have been there since ages, just not really used as much as they are on Android. Re. Health: it can fly in the US, and if it does,

You're right, app contracts have been there since ages, just not really used as much as they are on Android. Re. Health: it can fly in the US, and if it does, then they've got the momentum to port the stuff to other mobile OSes. Health itself is such a big industry that they might not want/need to use it just as a promoter for their devices.