If a casino does this, I think they hope that someone will make a deposit and lose money in the meantime. If you don't allow a player to withdraw without kyc - you shouldn't allow him to deposit either. Such practices prove that the website only cares about profits and does not care about the user.
As much as I agree with you, I also will not blame casinos entirely for this type of move, reasons being that, most casinos gamblers hate kyc, and as soon as they sign up on a casino, and the casino ask them to pass kyc verification before they can be able to deposit and play on the platform, that gambler will immediately abandon that casino and go for another one where they can deposit, play without having to go through/pass kyc verification.
This is majorly why a greater number of casinos this day would allow a gambler register, deposit and play without kyc, but the moment that such a player wins and requests a withdrawal, such user will be asked to pass kyc verification, and they do this at time of withdrawal because the gambler have no other choice or option this moment, other than to submit the requested documents for the verification, doing otherwise, the gambler may never be able to access his or her money, lol 😂.
You are right, this way the website leads the player to situation when he has to send his document, otherwise he will not receive the money he is owed. I think it would be better if this website paid him the money once and informed him that KYC would be required for subsequent withdrawals. Then, if the player agrees, he is fully informed, the website has shown him its content - everyone is satisfied.
Well, some trusted, or should I say, reputable casinos still allow their users to withdraw without kyc most of the times, but there is always a limit in amount to which a user can withdraw without having to pass kyc verification, like from $1 to $500 for some casinos, while for some others, it's from $1 to $999, and this means that withdrawals that is above this specified amounts usually trigger the kyc system.
And I know this because I've deposited, played and withdrawn from several casinos without kyc, and for most of the casinos, I only was asked to pass kyc when my withdrawal amount was above either $500 or $1000.
There are other casinos like Stake, where it's withdrawal of $10,000 and above that triggers the kyc system, but this was before Stake updated their terms of service last year or the previous one.
So in the nutshell and to summarize, some casinos do allow withdrawals without kyc, but the amount allowed it limited, and they won't also tell you if they will be asking kyc for subsequent withdrawals, you have to pass the kyc verification when ever they impose it on you.