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I don't see any indication that lack of niceness deprived him of any of his Jeopardy! winnings.
You say that as if he was simply planning to collect people's money, put it in a big pile, and sit on it while cackling evilly, but the ostensible plan was actually to make a documentary. The most obvious explanation for the Kickstarter failure seems to me to be "no one was very interested in a documentary about some guy who won a bit of money on Jeopardy!" rather than "no one wanted to contribute to making this documentary because its subject wasn't a nice enough person".
Similar to what? Writing a long article? Splitting an article into two shorter ones? (Neither of those seems like something anyone should or would be kicked off Wikipedia for. A bit of googling suggests it was for edit-warring and behaving generally obsessively and disagreeably, but I don't know how accurate that is because the people saying so are apparently on the other side of the "Gamergate" culture war. from Ryulong and that seems to be a thing that brings out the worst in people.)
Judging by the project description ("The Documentary Film about Arthur Chu: a spokesperson for social justice, the new king of the nerds, and 11-time Jeopardy Champion."), it was not really about Jeopardy. Most people do not care strongly about Jeopardy, but many people care a lot about their political faction winning -- you just have to convince them that giving their money to you is their best move. Mentioning Jeopardy success is just a way to separate yourself from the crowd.
Some people can play this game well enough to get 10× more money for ... (read more)