Gura gets people to seethe because she is exactly the person they wish they could be. She doesn't show up to work, gives no fucks about her coworkers, and makes tens of thousands of dollars a month while just drinking alcohol. She can also get sex at any time, do whatever the fuck she wants while nobody criticizes her and her fans simply approve and thirst for more of her.
Gura's life is the ideal, it's proof that "effort" and "hard work" are lies. It's proof that you too could do nothing and have everything purely on account of existing; but you don't, you're miserable, shitposting on this board with nothing but with your mental illness, cumstains and bills you are struggling to pay. You wish you could have it all like Gura, or at least have her, but you don't; and so you seethe, seethe at the unfairness of it all, that she does one stream, says something retarded in a fake loli voice and has her life set.