More than a dozen star Twitch streamers have switched to YouTube in recent years, and the service risks losing more to other livestreaming platforms.Amazon does not break out Twitch’s financials, though analysts do not believe the site, which has more than 1,800 employees, turns a profit.“It’s wild that Amazon is trying to force Twitch to squeeze more revenue out of top content creators,” Hasan Piker, one of the site’s biggest names, said in an interview.At his booth on the convention floor, Mr. Piker, known as HasanAbi on Twitch, was giving out faux newspaper front pages with a provocative headline: “Twitch Steals 30% of Revenue From Content Creators.” The subscription revenue change will only affect streamers with so-called premium deals with the platform that let them keep 70 percent of their subscription revenue, with 30 percent going to Twitch.“A big part of it is about trying to get to this position that allows us to keep sustaining and steadily being able to invest, being able to grow.” Mr. Clancy said Amazon was not involved in day-to-day decision-making."