[michaelt]

A casino or bookmaker doesn't need to heuristically identify betting behaviour that's 'smart'. They don't need to spot evidence that could be hidden by good opsec. No need to find micro-expressions or hidden cheating gadgets. Nor to do background checks to know you've got a buddy with insider knowledge.

All they need to do is check if you're cashing out more chips than you came in with.

[dmurray]

It's not trivial for the casino to track this against a determined adversary. If you're already thinking about "good opsec", you can get someone else to help cash out your winnings.

A buddy from out of town, or a losing regular, or a poker player who the casino doesn't care if they win. In Vegas some casinos' chips are negotiable, officially or unofficially, in other casinos.

[GBeastMode]

Exactly - they don’t need to catch you cheating, they just need to decide you’re bad for business