The document discusses how web-scale clouds have become dominant over legacy clouds due to their lower costs and ability to support new applications. It argues that carriers missed an opportunity with cloud computing because they focused on expensive, complex legacy clouds rather than agile web-scale clouds. However, carriers still have advantages like networks and mobile expertise that could be leverized by adopting a web-scale approach. The key is for carriers to seize the opportunity now before they lose more ground to cloud pioneers like AWS.