This has been explained multiple times. Xbox is a specific gaming platform. iPhone is a general computing platform. Where all kind of business from different industry ( Not just Games ) using Apps ( or anything connecting to the internet ) are relying on it in the modern society.
You've got it backwards—the only reason the Xbox is a gaming platform and not a computing platform is because Xbox doesn't want to allow other people to sell software on it. It's a distinction without a difference.
And one would have a very hard time to argue if iPhone was just a phone, in court or not.
And those who downvoted couldn't understand the difference as Appliance or platform based whether multiple industry interacts.