https://www.nytimes.com/2019/08/01/business/mixer-ninja-twitch-fortnite.html >Tyler Blevins, 28, the multimillionaire gamer known as Ninja, says he has a deal to stream exclusively at the Microsoft service. He’s quitting Twitch, the Amazon service where 12 million fans watch him play Fortnite. Yes, it’s a big deal.