The engine for Amazon earnings growth has nothing to do with e-commerce

It's interesting that Amazon Web Service (AWS) makes them profitable, NOT the e-commerce business. Like many others, I buy plenty of stuff there, but without their cloud infrastructure, there would be no Amazon. In fact, they found a way to monetize their excess cloud capacity for their e-commerce platform which is probably the most expensive resource to build and keep idle is a stroke of genius in hindsight.