> Is this good?

it is good if the losers are voluntarily participating. They are not coerced (stupidity is not coercion) into it, and therefore, it is reasonable that they expected to win the bet.

The only problem i have with polymarket (and others like it) are that insiders can often remain anonymous. It should not, and if an insider earns, but their win requires they remain anonymous or face some social/reputational repercussions, then that should happen.

Therefore, as long as KYC is enforced for these markets, i would have zero issues with their existence.

In most modern societies, we regulate all sorts of things that people would otherwise willingly do to their own detriment. We ban drugs; we have labor laws; we have usury laws; we require seatbelts; we have securities regulations; etc. (Notably, until very recently, this included most forms of gambling.)

So the mere fact that losers are voluntary does not, IMO, make the situation good.