Welcome to Twitch Prime! Have a crown. Amazon has unveiled yet another add-on for its paying Prime subscribers, and it represents the company's biggest tie-in yet with Twitch, the game-streaming service that Amazon acquired in 2014 for nearly $1 billion. The new add-on, Twitch Prime, will dole out monthly gaming-related freebies to any Amazon Prime subscriber who links their shopping account with a Twitch user ID.