and now you have neither
I don't see any indication that lack of niceness deprived him of any of his Jeopardy! winnings.
how much money could I get from random people on internet if I just openly ask them to contribute to my glory
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".
kicked out for similar behavior from Wikipedia
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 ...
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