I don't understand how casinos detecta the arbitraje, but they do even if you are using múltiple casinos for this practice, so, be careful.
I guess as soon as the gambler starts winning too much money with a large initial bankroll the casino detects it as a threat to their ecosystem. After all, casinos are fine as long as the gamblers are losing money. If gamblers start making profit, it will already trigger an alert on the system.
It’s not about winning huge money at all since some user winning huge profit without encountering this problem because casino can recover that loss from other player money since there’s a lot of losers than winners due to the house edge.
As I pointed out already, Casino do share same odds provider since only few provider is available on crypto casino. They are the one that inform the casino for the potential abused while casino matched their KYC identity.
Odds provider is the one that limit and restrict user to play on the sportsbook.