It all comes back to the intention and determination that must be instilled in the addict to be really serious about stopping gambling, and if he still continues to play it means that the addict does not have a very serious intention to stop. Because they still follow or are influenced by their desire to gamble, making it difficult for them to get out, which is actually their own fault.
Because stopping gambling must start from the sincerity of the addict's intentions and determination first, then the support of the people around him, especially his family or partner, and apart from that, he must also get closer to God. And in my opinion all three are enough, and the most important thing is the intention and seriousness of the addict so that the process goes well.
And the OP's story is like an addict who is lost and also feels like he doesn't have a family because there is no support or advice as the OP wrote, and it's normal for it to go that far.
Yes indeed to stop gambling those who are addicted must have their own intentions and determination, because there is no way they can stop if there is no intention and determination from themselves including with the help of encouragement from others such as their family or friends who support them to leave the casino. All that will be in vain if the main perpetrator does not have the intention to quit. I also think that someone who is already addicted to gambling will become a stubborn person, so it is likely that they will ignore advice or support from those around them. What is clear is that it will only harm themselves, and it is true that what you say is all due to their own mistakes.
To be able to stop gambling, of course, you must have a strong determination, because I am sure that in their environment there must be people or even friends who are equally fond of gambling or may be addicted. Now here will be a test for those who are in the process of recovering from addiction, such as when their friends win at gambling, there is a possibility that the gambler who is in the process of recovery will be interested if he knows that his friend wins at gambling and there is a possibility that the main perpetrator may return to gambling and may even be more aggressive with gambling that he will do again. Therefore, the majority of people who are in the process of recovering from addiction fail. And even more crazy.