There are lots of bets on Polymarket about when certain politicians cease to be the leader of the country. Trump, Netanyahu, Putin, Mojtaba Khamenei, Zelensky, etc. If they die, those markets are resolved in a predictable way. Death pools already exist, and it's a matter of time before we see an assassination attempt motivated by it.
It is a lot simpler and fairer to tax payers, due to high litigation costs, to simply make adhoc SaaS betting, as Polymarket provides, illegal. Why should tax payers have to pay for the regulation costs and, more broadly, society pay for the obvious disruption vectors arising from arbitrary speculation?
We're already seeing “insider gambling” from the current administration so I'm pretty convinced we'll see assassinations motivated by polymarket gains alone soon enough.