With that phrase, David Limp, at the time Amazon’s head of devices and services, showed off a new generative AI-powered version of the company’s signature Alexa voice assistant in September 2023. At a packed event at the Seattle-based tech giant’s lavish second headquarters in the Washington DC suburbs, Limp demonstrated the new Alexa for a room full of reporters and cheering employees. He showed how in response to the new trigger phrase, “Alexa, let’s chat,” the digital assistant responded in a...