How? Is it because you have "proof" that it's a real user?
If you watch the presentation or read the transcript, you'll hear that they already do a bunch of fraud prevention. I'm going to go out on a limb and say Apple is doing much more anti-fraud/fake account work that most others are able to.
I’d imagine there’s a lot of criteria being used. Maybe something like the age of the account, how often it’s used, of it was created from an often used IP address. Whatever it is, it’s probably not in Apple’s interest to disclose it.
