Dating apps like Tinder, Hinge, Bumble, and Grindr are placing big bets on AI-powered matchmaking. They are hoping innovations in the space can combat the app fatigue that has stymied growth.

Amazon’s Alexa voice assistant has been around for over a decade now. But over the past few years, it’s felt like Amazon was neglecting its digital assistant. In my own home, I found it buggier and ...