The Jeff Bezos playbook works something like this: sketch out a big, audacious goal in a fledgling market, launch with a modest yet fine-tuned project and build incrementally over many years until you’re the 500-lb. gorilla of a thriving industry. This is playing out right now with Amazon’s cloud services. An experiment that began a decade ago to offer startups access to its tech infrastructure has turned into the dominant player in the cloud sector, with $13 billion in revenue.