The real question is, why is it news that AWS isn't doing so yet? Who benefits from soliciting and presenting this testimonial that ARM servers aren't (yet) superior to Intel servers?
Sorry fpg, I was just applying the familiar snarky, condescending ridicule to ARM's efforts to penetrate the server market that you so gleefully apply to Intel's efforts in ultra-mobile as a point of contrast.
-=spaark=-
PS - before you bring up contra-revenue again, please note that all the very expensive ARM server R&D is being funded by someone, and thus far is yielding profits for exactly zero vendors.