> Bezos famously says Amazon's "secret sauce" is "obsessive compulsive focus on the customer." Isn't this move at odds with that focus?

So is not dealing with commingling. Amazon's focus is on driving down costs, and finding every way to leverage existing position for additional revenue. The claim of customer focus is true only to the extent of finding and greasing every possible route between the customer’s wallet and Amazon's bottom line. Anything else is (as one should expect of any executive’s public statements) simply PR.