“It’s hard to overstate my optimism for what’s ahead,” Amazon CEO Andy Jassy writes in his new shareholder letter. (GeekWire File Photo) Andy Jassy’s new letter to Amazon shareholders is a data-heavy defense of the tech giant’s biggest bets — from AI and custom chips to satellite internet and 20-minute delivery. In the process, the Amazon CEO discloses that AI revenue for AWS has hit a $15 billion annual run rate, that Amazon’s internal chips business is generating over $20 billion a year, and t...