Wait a minute, the music grand pubas want a special license (Read more money) for me to save my Amazon purchased music on a cloud disc and play same via an Android app or browser. Since I have already purchased the item, what gives Sony et al, the right to tell me how I save and access the item? I applaud Amazon for ignoring the music industry's desire to extract more money from me and/or decide how I may store and use such items once purchased. I hope Apple and others follow suit.
It's a complicated issue. For example, writers are saying the same thing to publishers. Each medium needs new contracts and new payments. Look at musicians, they're complaining about the same thing. This covers all artists, writers, actors, screenwriters, even producers. In fact, everyone wants to get paid whenever something moves to another medium. Basing your own music, which remember, like it or not, you don't own, but license, is considered to be another performance medium.
I'm not saying that I agree with it, but that's the argument going on for the past ten years or so. Until it's resolved, services like this will come under fire, as the licenses the services like iTunes and the Amazon Music store sign, prohibit it outright.