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The highest that they can do is to set an age limit which has already been set to 18+ or better still have a self-exclusion feature, but anything outside these two, the casino sees it as a drawback for their profit since they are in the business for the profits.
I think it would be better for casinos too if there were no gambling addicts. If everyone was gambling responsibly, the negative connotation surrounding gambling would disappear and without it online casinos would surely get more customers in the end. After all, their aim is to make profit, not to create problems for people.
We create problems for ourselves, it's not the casino's fault because we gamble. It would be nice if everyone was responsible, but that will never happen. I guess we can say that is impossible, there will always be people who will want more, stronger, and faster. That's probably true for most of us, and only when we make a mistake and get hurt we learn, that's just how it goes. And of course, there will always be people who never learn... and such people are eaten by addiction sooner or later. It's all up to us, either we learn something and try to be smarter and more responsible, or we let something destroy us.