Gambling outside of equities and securities is a negative externality. (Investment in startups, goods, etc. makes the economy spin. Investing in what hoop a ball goes through does no good at all.)
This puts plenty of people who shouldn't gamble into debt and lowers their societal fitness.
The other side of the gamble is probably losing on average too. Only the house and infrequent insiders win.
These private companies are fleecing our economy's dynamicity without reinvesting it in aligned positive externalities.
It's a cancer.
At least the lottery goes to education, in theory. My college was subsidized by the lotto, so there's that.
Kalshi and PolyMarket aren't doing anything positive.