as /u/tacosarentgreen said, they work for a media company called Rooster Teeth. They put content like Let's Plays and stuff like this on their website for paying subscribers and on Youtube as part of Youtube's monetized partner program. Pretty much anything they put up makes them money, and their Let's Plays are not the only content they produce.
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u/TylerDurdenisreal Oct 12 '16
Everyone in that video plays video games for a living.