Is there a reason why The Beatles' music (in digital format) hasn't expanded beyond iTunes yet?

It's really disappointing to me that I can't buy their music anywhere online unless I want to buy a disc and have it shipped to me or unless I want to use iTunes, which I don't. Surely there's money to be made by ending exclusivity with iTunes, and if there's anything the recording industry likes, it's the sound of piles of money rolling in. So, what's the deal?

While I'm on the subject of music, I also would like to ask why Amazon's mobile app, at least the Windows Phone 7 version, doesn't give me access to my cloud-stored music.

Apple, Microsoft, Google, Last.fm, Pandora, and a slew of other services can all stream music stored online... so why not Amazon as well? They already automatically store all of my music purchases online, they have a huge network of content servers across the globe, and they've got an app out for all the major mobile platforms. It seems like a no-brainer.