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Video games are react content. You watch the vtuber react to things in the game.
Watchalongs are react content. You watch the vtuber react to things in the movie.
Zatsudans are react content. The vtuber reacts to messages in the chat.
Superchat readings are react content. The vtuber reacts to superchats.
Karaoke is theft. Unless they sing only their own music with no cover songs.
Watching a live stream is react content. You react to things happening by posting messages in the chat.
Posting on 4chan is react content. You react to messages sent by other posters.