By Marco Martemucci and Aaron Swerdlow (June 1, 2017, 11:56 AM EDT) -- Streaming video game content is big business. User-created gameplay videos, live gameplay streaming, and esports tournament video coverage have become an increasingly prevalent part of the burgeoning gaming ecosphere. Juniper Research recently reported that streaming and esports game content will generate $3.5 billion by 2021, nearly double the 2016 total of $1.8 billion. Multinational brands, consumers, advertisers, investors and esports athletes are flocking to streaming game content, vying for revenue from advertising, digital tickets, subscriptions and game purchases. Amazon.com Inc.'s esports streaming site, Twitch, alone is expected to generate $20 billion in revenue and $1 billion in profits by 2020....