KYC is used to decrease scammer can gamble on the casino, there's no any 100% method to eliminate any scammer, yeah the combination of live discussion, video verification, and update the old KYC with the new one for every month will able to eliminate scammers, at the same time it will eliminate any honest and innocent gambler because they are frustrating due to very strict rules on the casino. Maybe you have a way to eliminate 100% scammer without make the innocent gambler leave the casino?
KYC on casinos are very common and this policy is to help casinos detect money laundering with support from their on-chain analysis and to reduce cheating on casino faucets, bonuses, promotions, freespins. If you implied they are scammers, yes, KYC is helpful for casinos.
If it is to reduce scammers and their scam activities aim at other gamblers, I don't think so. Casinos have different policies on KYC. KYC can be required after you register your account or it can be required after a casino smells something suspicious and strange with your account. The second case is not helpful to reduce scammers on a casino and can not help other gamblers much.
Not only that, scammers offer to buy accounts which have passed KYC already to perform their scams
Buying accounts and use them for scam, it won't last too long. If a casino requires that user to submit an advanced KYC, the user with a bought account will have to abandon it. If he has money in that bought account, casino will seize it.