Update: It did happen again. In fact, the dildo-throwings seem to have been a pre-planned tie-in for "Green Dildo Coin":
https://www.nbcnews.com/news/amp/rcna223905So the prediction market in this case maybe isn't so much causing the bad events, as just being a useful side channel by which the insiders/bad actors who've already planned the events can sweep up a little extra money from the prediction-market equivalent of "retail investors" — the ones who are inexplicably willing to put their money on the table with no information whatsoever and wait for someone else to take it.