Twitch is not a person, it is a live stream website. However, one person out a script through Twitch to make it such that the chat input from users would press a button on the game, like if a viewer said "a", the game would press the a button.
so the people watching are the people playing?
Correct. The whole reason it is so popular us because over 10,000 people are playing the same game together.
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