This is kind of fucked up. You bought a locked down dongle that works only with Google services. You can't even play your own media on it[0]. Now you expect every service to support google's dongle?

Here's what you should have done: get a TV or a dongle with DLNA support. Then your PC will show up as a source and you can play any goddamn thing you want. Or you could have got a TV or a dongle with android on it, then you could have just downloaded Amazon's app.

[0]no "official" way at least