From there, it is easier to coordinate and find some professional help, but if one does not have friends or family, the descent into complete mental and physical ruin is almost certain. That is why is so important to care for those who have shown kindness to us.
Instead asking for loans to gamble all away, ask for help and forgiveness.
I don't think the problem is that the person doesn't know anyone who cares about him. The problem is that the gambler hides his gambling addiction because he is ashamed. If you feel that you are no longer in control of yourself when gambling or spending money that you wanted to leave for important things, then this is the right time to gather courage and tell your loved ones about your problems. Only by admitting that you need help can you get rid of your addiction, otherwise it's just trying to run away from your problems rather than solve them.
Well, It is obvious that in order to face a problem, one first needs to realize there is one.
I kind of agree with you when you say that shame is an important factor when comes to talking about gambling addiction to family and friends. I have myself witnessed a case when a family member of mine ended up losing around 50$ at dices, and he was so ashamed he could not let anyone know, except me.
In that case I was the insider who that person trusted the most.
Honestly, I am not sure how the problem of keeping the problem to oneself could be addressed, the only thing that comes to mind would be to admit it to people you don't have seen before: first on internet, then face to face, as a kind of practice, so eventually one can tell one's family.