While Amazon is just a rumor, there has been no official statement from Amazon about it. And I think they should use this system, because a lot of people wanna ease, accuracy, and fast in transactions. And we all know about this : bitcoin is the best in this thing.
Ohh I'm far away from gaming, just steam is really big thing, and if they will make it official and understandably for everyone and then will advertise it, then probably games using cryptos for some cosmetic transactions will be new hype train, for example Dota 2? DOTA coin