The people running Polymarket are unethical, and if they persist in doing this, the ax will be on them. They can be considered warmongers because they encourage wars instead of one of the platforms calling a stop to this insanity.
Polymarket is a bad precedent; there could be more coming up. Seeing how profitable this platform is, they should heed the call of the community to moderate bets and not let bets like this come out.