An obsessive gambler is a psychotic just like a drug addict or an alcoholic.
They are handled the way you handle any other psychotic. They don’t have to do anything for real in life because it all depends on chance and never on themselves. So you have them on the minus effect scale.
Life isn’t real to a psychotic gambler and therefore they never really buckle down to anything. Consequences are unreal to them and criminal acts are incomprehensible as nothing is real anyway.
Getting off overts is nothing to such people because they are not there and take no responsibility for them. Everything else is responsible — not them. Thus you have to find the trail to the R/Ses on the subject and discharge those.
This aspect of such a case is the emergency number one handling.
It has to be recognized for what it is — Psychosis.