Your question if I'm not wrong is referring just to crypto casinos and not fiat casinos included, and I think cryptocurrency is decentralized and transactions can't be tracked, I believe crypto casinos only have the options of payments done through cryptos which implies that the transactions will be done through a wallet to the casino, hence the casinos wouldn't have the need to interrogate the deposit since it's also a win win strategy as well for them

I think Interrogation will be more possible and easier for fiat casinos since this transactions can easily be tracked and investigate.