L ive streaming has become a popular source of entertainment for teens and young adults, making stars out of fresh-faced online content creators in the process. Over the past decade, Amazon’s Twitch has reigned supreme over live video-game streaming, while challengers have come and gone. Both Microsoft and Facebook have tried and failed to launch popular live-streaming services, while YouTube Gaming has fared better. Now, a burgeoning live video platform called Kick is gaining traction after poaching some of Twitch’s biggest creators. The company’s boasts about lucrative payouts and lax rules have helped it to draw edgier streamers. Earlier this...