Supporting underage gambling is when am aware that the kid is gambler and I didn't stop him or her. In this situation, I was not aware that the kid was secretly gambling, therefore if they had a massive win, instead of letting the money to waste, I will offer to let them use my details to pass the KYC but after withdrawing the money, I will keep it in a savings account for the kid until he or she comes of age and I will also make it a duty to stop the kid from every gambling activities since am now fully aware of their gambling activity. I will make sure to deprive the kid from gambling until he or she is 18+.  Another method I could use to handle such a situation is to deprive the kid from gambling and let the KYC hanging like that until they get to 18+ when they can have their IDs and pass the KYC.