You're not very smart huh? Twitch isn't hollywood, it's about game streaming. If you take a look, almost all top twitch streamers are ex pros or insanely good at the games they play. They are not necessary entertaining or good looking. He is an amazing FPS player and really good at PUBG, let's not forget that game peaks at 1,5 million players a day, which means a lot of people are interested at watching insane players at the game they like. Also he is calm and chill, a lot of people like that. Not everyone likes to watch some fake persona which tries to be funny and entertaining all the time.
Only because you don't enjoy something, doesn't necessary mean others won't. It's not rocket science, it's called personal preference.