Tyler Steinkamp

Up all night with a Twitch millionaire: The loneliness and rage of an internet video game rock star from New London, Mo.

NEW LONDON, Mo. — Just before midnight, six hours into his 10-hour Twitch live stream, Tyler Steinkamp’s rage begins to erupt. He’s just scarfed down a dinner of cold chicken fingers over the sink during a three-minute ad break and raced back to his computer, where he is playing the “battle arena” game “League of…