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If a gambler violates the rules, this is not a weapon, this is the way to clarify and to update data about the user and to see whether he/she breaks the rules or not. The true weapon is withdrawal limitations. This is how a casino can avoid a big earthquake that a single withdrawal of a jackpot can make, for example.
Its a weapon too because if the gambler fails to produce what the site is asking for then he will lose the winning rewards but if the site actually wanted to stop the user from restricted country they can do at the time of registration itself right? Not every casinos are doing it but we had seen lot of such cases in the scam accusation section in the last few years.