The fastest-growing segment of the video game industry has nothing to do with playing them. Game streaming on sites like Twitch and the subsequent rise of e-sports, competitive games played professionally, is attracting millions of dollars of investment and is on track to generate more than $1.0 billion in revenue next year. In episode 3 of the IBISWorld podcast's Game Changers limited series, editor Kieran Newton and analyst Jon Hadad break down how this happened, why people are watching, and whether traditional sports should feel threatened.