Something that already exists in real life, in bethomes, self-exclusion for compulsive gamblers.
I speak from experience and this would be a great tool because it would prevent people suffering from this problem waste your own fg.
A tool for life that is, when you exclude yourself, once done no turning back.

I am very concerned because it is a big problem which can be solved in this way, surely help many here, including me.

could still gamble via pm so even without access to that subforum you could find a loophole like betting through a friend.

Maybe, but restrict access to subforum it reduces the chances lot