Ninja, also known as Tyler Blevins, had signed an exclusivity deal with Mixer last year after amassing more than 14.5 million followers on Twitch - but Microsoft announced in June that its live-streaming service would close down.Mr Blevins, who has dyed-blue hair, has earned millions of dollars by playing Fortnite, courtesy of sponsorship deals as well as revenue from the millions of viewers who watch his videos on Twitch and YouTube.In a short promotional video he posted on Twitter, appearing