>the house take on the major platforms is vastly higher than with traditional sports betting
What kind of markets is this referring to?
Polymarket still charges 0 fees. While Kalshi's fees+spread can approach or even exceed traditional sportsbooks on some markets, neither of them have any interest in banning winning players, as they don't take a side on any bet and directly benefit from more betting activity. Kalshi also pays interest on bets, which can add up on longer term positions.
Betfair has operated with a similar model for decades in the UK and elsewhere.
I was referring to platforms like DraftKings, which are extremely sleazy. I think Polymarket and similar low/no fee markets on the other hand are awesome.