[sukuriant]

This should be qualified with: since they already have it via credit card companies. You give your social security number when getting a credit card for a /lot/ of reasons. And these tend to be a good reasons.

[lostlogin]

The majority of Apple's revenue is from outside the US. I have no idea what proportion of their credit card data is from outside the US, but we don't have these ID numbers. http://www.worldofapple.com/archives/2014/01/27/apple-posts-...