“Google (along with Yahoo! and Microsoft) has been buying dark fiber and deploying it between its data centers for the past decade.” These networks that connect Google data centers are capable of Terabit speed push more huge amounts of data across the strands.”
Because dark fiber hard to get, Amazon cant easily catch-up by spending more. It is now structurally incapable of competing with Google in terms of supply of bandwidth between its data centers and the cost of delivering that speed.
Read this article to get the details of How Big G may catapult over Amazon in the race for corporate clouds and everyday computing.