I have not read this very carefully, but these conversations seem to be worried about classical cryptocurrency attacks -- we have rational agents who try to maximize their money. A threat of someone loosing all of their money will prevent one from doing something.

However, in my example, this is not the case at all. A PR firm or EvilCorp does not care about success of cryptocurrency, they just want to make sure that "The Citizen" will fail. For example, your link talks about "penalizing both sides hard" like it is unavoidable -- but this is exactly what EvilCorp would want.

I don't think I have seen analysis of the prediction markets which assumes actors who are willing to lose money to get the desired results.