That's right, in my opinion, someone who is addicted to gambling will find it difficult to recover from their addiction, because someone who is addicted tends not to want to see anything other than their addiction because they will only focus on gambling, which has become something they usually do. but in my opinion it depends on the level of addiction, if their addiction is serious it is possible that they will not be able to stop gambling and as you said they can go back to gambling and it might even get worse in the future.
and if their addiction is not too serious, chances are they can recover in a short time, but it also depends on themselves whether they really want to stop gambling or not, if they are still hesitant about stopping gambling, chances are they will return to gambling again. a certain time because they cannot control their desire to gamble, and even if they still gamble, I don't think they will gamble within the set budget, but to minimize the risk of serious gambling addiction, perhaps this can be done by reducing their gambling activities and by limiting each budget when they want to gamble, but even so it doesn't guarantee that they won't become addicted to gambling.
Yeah, it depends how deep in the addiction the person is.
Also it depends on the why the person wants to stop being addicted.
At the end of the day, addiction is a difficult thing to overcome, and it requires a lot of work and time.