"Coin" is such a generic term relating to currency that I can't fault Amazon for using it. Nintendo has Play Coins. Next you are going to tell me someone is going to try to trademark "candy" before others start mooching off that.
Amazon Coins and Bitcoin solve two different problems. The average Amazon customer probably heard of Bitcoin but doesn't know exactly what it is. They probably understand that Amazon Coins are just gift cards though. I don't see the problem.
. . . should we blame the government? Or blame society? Or should we blame the images on TV? No, blame Canada! Blame Canada! With all their beady little eyes and flapping heads so full of lies. Blame Canada! Blame Canada!
I'm sure AT&T is going after T-Mobile's spectrum and even their infrastructure to an extent. That does not explain why T-Mobile is selling though. I'm sure there are a lot of reasons. The iPhone may very well be one of them. Your comment does nothing to debunk that.