Yes and I hope that they can immediately realize that this activity can cause a lot of problems for their family including in terms of finances, agree with you, sooner or later it will definitely become a problem even though initially they thought it would be fine, but as we know gambling develops in humans without them realizing it, especially when they have entered the addiction zone, they will continue to play and it is very likely that the allocation of money for basic needs such as food will be used for gambling. Of course it is very dangerous and I can't imagine what will happen to the family, not infrequently we see that lately there are many divorces due to the consequences of gambling which of course makes their economy decline drastically. So yes there is nothing else but to stop, that's the best and if they have realized that this is really bad then hopefully they can consider stopping and reducing all their gambling activities. That's right, some can realize it and some can't at all, so it really depends on them like you said.
And if they can reduce their gambling activities for their own good, they will not experience the problems other people have experienced. They must pay attention to basic needs for their family rather than using their money to gamble because that is their current concern so they will realize that gambling is not a concern they need to do. If his family's basic needs can be met and he still has free money, he can return to gambling. But if he is worried that he cannot care for himself well, he should not gamble and do other activities with his family. By realizing that he now has a family, he will prioritize his family more than gambling because it is just having fun in his spare time.
Yes as I said above, inevitably if they are married then they must be able to think that there are already big responsibilities that they must focus on in the future, and that means they must be able to reduce their gambling slowly, because I am sure to stop suddenly it is almost impossible especially for those who are already addicted. Therefore, they can start by reducing their activities and divert their attention by adding other activities such as adding jobs to increase income. They should be able to think and take examples from the many cases that have occurred who ended up divorced because of gambling which affected the family economy.
When a person gets married, their responsibilities become greater, so they have to focus on meeting their family's daily needs and can reduce unnecessary expenses. And by reducing their focus on gambling, they can focus more on their family, which is what is more important to do. And if he earns income, he can hand over the money to his family so he can use it to meet his daily needs.