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Not good to leave them alone if the affected person is our friend or relative since we can do something to help them by giving advice and if we just leave them because they are not really worth the help then maybe they might experience more the worst. So its good to give them advice so they can realize that everything they do is not good and they should not bet excessively so that no funds intended for more important matter used for gambling. They should learn from their mistake so they can correct their bad behaviors.
Although we don't have obligation to do this thing but for sake of humanity maybe a simple word of advice can help them to determine what's good and bad for them.
I'm sure the thing about word of encouragement is truly helps those who are in need, especially relatives or friends. But bear in mind, that we also must set boundaries for ourselves. Helping or handling addiction cases is not an easy job. So if the condition affects us in a personal manner, we should just direct them to the professional. Specifically in the context we can't help further, it should be okay to leave it as it is, instead of the problem is also affecting us.
Encouraging words of advice or suggestions can indeed be useful for those who need them, but will they work?
Can it make someone change for the better and meet our expectations?
I would answer no because what they need is not encouragement, advice or advice, but what they need is action that can really help more competently and be seen in real terms, not just series of words.
Sometimes helping other people is much more difficult than solving our own problems and there are quite few cases where we will also be impacted by what other people do when we try to step in to help them.
I sure that there are also some people here who try to help other people, such as friends or relatives, but we as helpers actually get less good.
It has become commonplace when good intentions and good attitudes get us what we don't deserve.