Amazon already is benefiting from its AI investments.When you think of Amazon (AMZN +1.77%), you may first think of shopping. After all, the company is an e-commerce giant that many of us turn to on a daily basis for groceries, essentials, and even access to books and movies. And this business has helped Amazon become a market powerhouse, delivering billions of dollars in revenue year after year.But another business is the company's profit driver, and that's cloud unit, Amazon Web Services (AWS). It's the w ...