This is a very nice idea indeed. I couldn't agree more.
Having this feature would surely lessen addicted people or people to be addicted in gambling. However, there would be another way for them to cure their thirst. They could still play int other gambling sites if they've hit the limit on a certain gambling site, so on and so forth.
But still, implementing this kind of feature will help a lot of people, and I hope gambling sites are okay with it because all of them doesn't care about people's money, all they care is about making bankrolls every single day.
This can help people not to get addicted to gambling. If strict rules are in place, people will only gamble within limits and will never face gambling addictions. However the question remain that who will make this rule and ensure it is being followed by all casino's and the players ?
For gambling site if they implement it then it is their loss as if people do not lose then how will they make money and they are here for business. So it is onus of each individual to know their limits and be in self-control rather than expecting other to make changes.
We can imagine if we are a gambling owner who has a popular gambling site. And suppose there is a regulation about limiting the gamblers not to become addicting. In that case, I think we will negotiate with the regulators about the amount that will be fair enough for us if we want to use it for our site.
We will need to search for a win-win solution that can works for our site and all gamblers, so we can still make money, and the gamblers can avoid becoming addicting to gambling. Perhaps, that can work well if the gambling owner wants to help people by solving the addicting problem, and the gamblers like to avoid the addicting.
It is not just as simple as that because that will need more discussion between the regulators, the gambling owners, and the people involved in that. Perhaps, we will see other things that will come out from each country, especially for the countries that allow gambling.