This thread reminds me of the argument I was having a few days ago. When we talk about minors not being allowed to gamble, it's a general rule everywhere, not just in some countries, so if a child who is below 18 years has been gambling without the knowledge of the parent and he or she happensto win an amount which requires advanced KYC to be passed, if the child uses his real ID card, it will be noticed that he's not yet of age.
As a parent to the child, can you allow the child to use your details to pass KYC verification, if asked? And if you do that, does it also mean that you are supporting underage gambling?
Your question is extremely provocative, however.

I assume that most gamblers will say that they don't support gambling by minors, but if the situation you described occurs, they will probably agree to provide their data to go through the KYC procedure. Strong convictions are good, but when a large win is at stake, this can be neglected.

An indicator of double standards is that if a child lost a large sum of money, and, for example, even ended up in debt to the casino, the same hypothetical parent-gambler would begin to prove that he is against child gambling (after he provided his data for the KYC to receive the prize in the 1st situation).