~ But these days people are more concerned about making profits, they don't care who's playing, they will tell you if I don't allow him to play here, he will definitely go use the online platform. ~
I don't know how it is in your country, but normally such casinos could be fined or even closed. It's similar to selling alcohol or cigarettes to those who's underage. No matter how much you concerned about making profits, you shouldn't do that.
Also, like you said, "gambling must still at least possess that sense of decency". It's immoral to allow young people, people who don't possess certain knowledge essential for safe gambling to play games of chance at your place.
Yes, if there are casinos that do not apply any restrictions or do not apply the rule that a minor is not allowed to participate in gambling activities in their betting shop then yes, the government should step in to solve this problem, and if indeed from the beginning the government only allowed gambling for people who are adults then yes, I think there is no reason for any defense for the government not to immediately solve this problem.
At least the government must act decisively by giving sanctions or penalties in the form of fines or other penalties if indeed the casino still allows children who are still underage to be involved in the betting shop. On the other hand, it is clear that for casinos, they certainly want the freedom to allow everyone including minors to be involved in their betting shops because their goal is to generate greater profits from the number of gamblers involved, meaning that I think for this problem it is back to the government who must act decisively and also indirectly this is also the duty of parents who must be stricter in protecting their children from reaching gambling.