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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.
on the contrary it won't be for the betterment of casinos and betting sites if there are not gambling addicts, a lot of casinos will fade out of the market if we all have responsible gamblers gambling responsibly. It is like a responsible smoker who only chose to smoke a single stick of cigarette a day calculate in a month is 30 sticks, whereby a chain smoker finishes a packet of cigarettes a day, times it to 30 days. Between the two individuals who's bringing much profit to the company in a month? I believe you best know the answer. Casinos knows too well that without gamblers getting addicted to the game's they won't spend more on it gambling that's why they make sure to improvise every means to give us games with addictive characters and features to keep business rolling.