Amazon’s Navigation Bar Is Revealing
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Browser - Customers come to amazon.com, click through to a category, and just browse
Inbound link - Users are fed to a landing/product page by some other source (like a shopping engine or app)
Search - Someone comes to amazon.com looking for a specific product an immediately places a search
Understanding which categories are used by these different classes of user allows you to re-focus your primary navigation to maximize efficiency for each class.
"Browsers" need categorical navigation. Notice that the top three (non cloud service) categories available for immediate browsing are all entertainment related. These are categories with a significant requirement for discovery; that is, visitors looking to discover new content.
My guess is people buying books know what they want but there are a lot of customers who could be tempted into buying Amazon's cloud services.
If they are going to promote a free service, and then scare you with a "binding contract" agreement (which indicates they are really serious about it), they should at least go to the trouble to assure you that they won't charge you for what they say is free.
They also don't guarantee security or privacy - that's fair enough, pretty standard.
They know that being early to market is insanely important today, even a year delay can end up being the difference between Groupon and Google Deals. It's typically impossible to compete with an entrenched product by one of the big tech corps as they have the engineering man power to duplicate any improvement you make over their formula if you start depriving them of the tiniest portion of their user base.
I prefer physical albums to mp3s, but if I can get a Grammy-award-winning album for $5, I'll live with mp3s.
If this is a response to iCloud, it's not a very "Apple-like" response. Then again, Amazon's cloud offerings aren't very "Apple-like" either, for better or for worse.