Maybe this type of therapy system exists to get addicts back on track. There are many such drug treatment centers around us where drug addicts are treated. When the family of the drug addict admits the drug addict to the drug treatment center, those in charge of the drug treatment center try to bring him out of the drug addiction through various therapies and different means. A drug addict is as dangerous as a gambling addict. If a person who is addicted to gambling wants to come out of this addiction, then in many cases such therapy is given so that he will not be attracted to gambling later on. There are some families who don't like children or husband gambling and they try in different ways so that their son or husband does not get addicted to gambling and for that they give different pressures in the family which is also like a therapy.
Gamblers can undergo similar therapy techniques like their counterparts the drug addicts. But, on the long run, the changes wouldn't be as fast as to be compared to a therapist who specializes on handling gambling addicts. I could recall that drug addicts are being sedated to sleep for hours and they could be recovering from it, after days of not staying on drugs.
An addict is challenged to always think of gambling, despite spending days without the game. Therapy for addicts in gambling only works best in discussing things out and honest responses from the addicted player. Which could help in redirecting his motives on gambling to another channel where he could find out a better livelihood other than excessive gambling.