It's highly possible that he inspired all of them to become a streamer also, the reveal that Hakua was inspired by 'someone' to Livestream and be her true self is a bit too early, but it won't be if the others were the same
I also think that he was pretty big in the Livestream community that most of his fanbase wants him to return, which might be the other residents of the dorm.
Now, I think the 'Trauma' he experienced that resulted in him quitting Livestreaming is going to be either his classmates making fun of him, calling him a geek/nerd and making fun of his smile, or that one of his family member (or his whole family) became disgusted that he livestreams.