They end up making things worse for themselves usually due to those silly reasons.
Now that you mentioned developing countries, another problem that they should face would be that not everybody has enough money to pay a specialist to help him/her, so I suppose that the problem is harder to solve there because of poverty, not to mention social stigma linked to believing that only insane people need therapy.
In such cases, family and friends should prioritize and save the money to pay for the therapy. The good thing is that a consultation is often cheaper there than in other regions of the world, but tools and attention might be worse too.
I've had a couple of friends who were gambling addicts, they were addicts and gambled for years, but at a particular point in their respective lives, each of them began to see reasons why he needs to stop gambling asap, so as to get free from the addiction, one was having issues with his wife on daily basis because of his excessive gambling activity, another at another time started having issues with finance which also later started affecting his presents at his work place, since he spends money on transportation on daily basis to and from work.
This guys never went do any doctor or specialist, they did partake in any form of therapy to get free from their gambling addiction, they both got free from it when they both on their respective times, decide to quit, and made of their minds to discipline themselves and stand firm to that decision to never gamble again, atleast, until they are sure they are no longer controlled by gambling, and surly, it did worked out for them..