That's like being cut off at a bar. But that might be effective on one casino, but a real addicted gambler has many accounts on many casinos, and he will just move to the next one.
In truth, there's nothing you can do except lock him up (physically)
Better to lock up his money
Without money, no play...
Unless if there are free spins, but they go fast... unless he is very very luck
If I understand what you guys are discussing about correctly, I would say it's definitely better to lock up an addicted gambler physically, lock him up in a single room with a very small window, and take away every gadget from him, no phone, no radio, no nothing, just him and his mind to wander and think 🤔
Leave him there for like a month or two, I believe that by the time he comes out, he must have had a brain that has ressetted itself.
Locking his money won't be effective because doing this may drive him to go and steal from other people, or borrow, but note that in the absence no one to loan him money, the urge to gamble Immediately immediately may drive him into stealing, and this could land him in jail or possible end his life through jungle justice.