I don't see how this is more degenerate than betting on roulette at a casino. Prediction markets usually provide more efficient odds than casinos because the house profits from trading volume instead of from the spread, so it's essentially just a way to bet on a game of complete chance with a much better average-loss than you could get on games of pure chance in the past. If people want to bet on coinflips, it seems objectively better that they have access to a way to do that in a way where they only get fleeced for 1% of their bet rather than 5%+ of their bet.

For sporting events, for example, the alternative to prediction markets 5-10 years ago was to use a website where you bet against the house directly, and they'd usually take around a 15-20% spread, and they'd ban you and keep your account funds if they decided you're winning too much. Now you can bet on the same events on prediction market sites, with around a 1-5% spread, and the house doesn't care how much you win (so there's actually an argument that you're playing a game of skill, compared to the old format where you definitely weren't, since you'd be banned for being too skilled).