Ubuntu is also shipping with two new Firefox extensions that ask to "install" certain web apps when you visit them. Havent audited them yet, but my tinfoil suspicion is that these add-ons are leaking private information to Canonical by asking "is this a web app that can be downloaded?" (this is in addition to the current controversy that Unity searches are being leaked).

By the way, Amazon is pre-installed. I noticed yesterday that Amazon web pages still open up in the Amazon icon on Unity -- even after I had removed the unity-shopping-lens.