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its literally just something they can do that takes 0 attention span so they can interact with chat, its one of the best games for that and the fact that it appeals to millions of autistic 6-11 year olds is the icing on top. Also the fact funny bad things can happen to the streamer at random.
this is the same why hearthstone streamers got so popular too back in its hay-day. Game that takes literally 0 attention span, and streamers can get fucked but lolsorandom shit all while they can interact with chat at maximum capacity.