I would bet that Apple would probably rather you not have a relationship with Amazon Video at all, getting your TV and Movies from iTunes instead.
But Apple doesn't have a majority of market share (by number of devices), so, in my opinion, antitrust regulators have completely discounted their behavior.
On the other hand, the experience of using Apple Pay is miles beyond Google Checkout/Wallet/Pay/Android Pay/whatever marketing's new name-of-the-week-is, and only allowing One Blessed Way of taking payment on Apple devices is a big component of that. Having one consistent flow that I can execute in three seconds from muscle memory really does make buying-from-random-apps-and-retailers experience much nicer and more predictable than it is on the web and on other mobile platforms.
Apple Pay and app store/itunes payments are completely separate. I had apple pay set-up for awhile and when I went to purchase an app, itunes wouldn't accept apple pay and I had to re-enter all my CC information into itunes.
Maybe that's more a joke than anything - but it wouldn't surprise me to find out that the Fed to Blackhat ratio wasn't something huge, and those actual BH attendees were either other researchers who go to "be cool" (or legitimately present research), or were major "n00bs" who don't understand what they are trying to get into, and will likely end up in the Feds hands in short order.
Or maybe all of them are faking it?
It just seems like - if you were a real BH worth your salt - a conference of any sort where you effectively are advertising your creds would be avoided. If you went at all, you'd want to do it under the radar. At which point you might as well go to DefCon, Hope or something.
Its an interesting scene nonetheless - which maybe is why there are any attendees at all; maybe the whole thing is just one giant form of cosplay LARP - and the people who participate are really BH's and LEO's? Like some kind of weird meta-thing going on...?