Banshee Amazon Store disabled in Ubuntu 11.04 by Canonical (Network World)

It would be more correct to say, "pay us to select your application as the default application in Ubuntu even though we've already selected your application to be the default because we think you guys did an excellent job building the application and we don't want to spend the money or the time building or our application"

And its important to note that Canonical has in the past changed the affiliate ID for the rhythmbox magnatunes store in the past..and garnered a small amount of revenue that would have otherwise gone to GNOME from Magnatunes.
http://www.ubuntu-user.com/Online/News/Ubuntu-One-Music-S...

So in one sense this is progress. Canonical didn't just hijack the Banshee revenue stream entirely. They learned _something_ from the experiment with Magnatunes. (Interesting to note that even with magnatunes enabled by default in Ubuntu..prior to the U1MS being available...Ubuntu users only accounted for 1/6th of the rhythmbox based magnatune revenue...fascinating don't you think if you ascribe to the idea that Ubuntu was the most popular rhythmbox distributor at the time).

Canonical actually reverted rhythmbox back to the default at some point and left the plugin enabled by default as well.

-jef