Everything depends on the terms of the casino,
Really!
I disagree with due respect. This statement in itself is not correct. There are regulations in place that oversee casino practices. Casinos are not GOD if they write 'our decision is final' in small prints somewhere in the terms and conditions.
there is no "must" or "should" in this case
If the player is from a restricted territory it is the casino's fault to ensure geo-blocking and proper KYC at the time of registration (not when the player requested cash out). Even if a player deposits by deceiving the casino in question (which I am not promoting nor implying), there is no legal contract between the player and casino which means every bet placed is void and null.
We have seen
in this case that the casino is liable to give back the part of the deposit which is there with the casino after calculating overall profit and loss (exactly what I am suggesting, though not ideal).
If casinos should, many players from restricted countries will try to abuse the terms by making deposit then play. If they win and they are able to withdraw then it will be benefits for the abusers but if they lost then the refund policy (if it is must as what you said) will also a benefit for the abusers.
Yes, there is risk and that is why if you are a KYC casino you must do it before accepting a deposit. I mean, you can't have 'all five fingers in ghee'
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Sorry if sounded rude. I intended no disrespect to your opinions.