It is not a nice idea, it is a totally stupid idea which thinks that people who gamble are retarded. People who gamble are not retarded in the way they have a low IQ and often it is the opposite. Most gamblers I met are in a way intelligent introverts who fail in their life.
Gamstop and such features are nonsense if we really want people to stop gambling. It is another challenge for them to overcome and unlike probability (that needs to be beaten to win in gamble), they are able to overcome it. Also after this nonsense does not stop them to gamble, they have always an excuse for their misbehavior. If those fragile fences fail, they think they are not guilty, the casinos or regulators are, because they did not fulfill their obligation.
The only way how it is possible to restrict gambling and other sins is to show people from kids that the world is full of traps and you either go after enjoyment and bust or you go after hard work. But this education will never happen because it can not happen. Capitalism is the most effective economic system, but it needs most people to be self-destructive. Casinos need such people, affiliates need such people. There is no such a way like safe-gambling.
All those serious debates about Gamstop should stop at least between professionals. It is hijacking the core of the problem. Gamstop is just a cover up for society and for people who are responsible for gambling and who can not bear the guilt that they are the tools for self-destruction of other people.
If you talk to God, you are praying; If God talks to you, you have schizophrenia.