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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.
Unfortunately, the feeling of gambling is what they make addicted, in addition, casinos invest in research and development about how to put more players getting sucked into the game. I think it would be too ignorant to expect people to just gamble responsibly, where in fact, the thing they play is addictive. Not all people have great self-control toward themselves from external influences.
So I believe the OP initiative is what solves and fixes those who need help, outside of casino control to enforce their gambling responsibility policy, such as limiting or restricting users from playing.