As far as I know there are very few people who become addicted to gambling and share it with their family or others. What we typically see is that no gambler shares their addiction. They try to keep it secret as much as they can. A gambler will surely get a good solution when he shares this matter. Hiding only increases the problem so it is very important to share with others as much as possible. In some cases, it takes a long time for gamblers to identify the problem, so it is not possible to bring them back in time.
And the worst part is that gambling addiction itself can be very easy to hide, unless you were taking a look at the financial statements of the addicted gambler you will have no way to know that they are going through some financial problems.
While when it comes to other addictions it is very easy to tell at the early stages that there could be something going on that you are not being told, and this aggravates gambling addiction to the point that when those people finally ask for help, the consequences of their addiction are too severe and it will be difficult for them to ever make a full recovery.
Big difference in terms of gambling addiction, some gamblers can discreetly hide everything and can act as normal as there are nothing wrong with them, even they are already suffering they can hide it unless you are close to the person and you can see their finances or you hear things about them regarding to any related financial concerns.
But, if you don't have that capabilities, the only way that you can notice it is when they go directly and ask for some help.
Without them asking, your hands are tight and you don't have any clue on how to help and how you can change the way they look
at gambling, they will continue to push and lose more for sure.