Gamblers who have severe addiction are very difficult to advise, and fundamentally, we don't really need to. I think that cases like this are common, those who are addicted will refuse to accept defeat. Even if their financial condition is already unstable, they will strive to continue gambling regularly. I think the goal of people addicted to gambling who continue to wager their money is no longer about seeking entertainment, but rather they are chasing their losses.
You are not wrong about them chasing their losses being their major objective for gambling, but I would rather try to advise and call a gambling addict to order than leave them completely and not advise them at all because I believe they will not take any advice. We can never be too sure that little convincing we try to impact on them might actually change their mindset on how they chase their losses. The chance of winning a gambling addict out from addiction is low, but it's still better than doing nothing.