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Yes, there are some casinos that don't have any such limits or restrictions but I guess they must have age related restriction in order to stop underage people from using their platforms. It could cause huge problems if a young gets addicted to gambling.
yes of course if our perspective is looking at the moral side, then the rules must exist in every casino to filter underage casino users, but if there is no government regulation to limit casinos then casinos without restrictions are legal, and we cannot argue with that. but if the demand is moral then it needs to be limited even though there is no legal regulation from the government directly.
But if the demand is moral then it needs to be restricted even if there is no legal regulation from the government directly. Because we can see the moral law from the impact that it has, as you said that it will be bad for the younger generation if when their children have access to gambling, it will create a bad generation for a nation.