It's good if there are dedicated hotlines for gambling addictions on a country, though if there isn't one available, intervention from medical professionals such as psychiatrists would go a long way in helping people already addicted to gambling. Turning oneself in is difficult, especially if they are still in denial of their condition and are shrugging it off thinking that they are still 'normal' despite their obvious behavior of being hooked to a certain game. It's a case-by-case basis, so you can't really know for certain whether an individual is already deep into the addiction or not.
A person can independently get rid of (recover) from gambling addiction. One addiction can be driven out of your life with the help of another addiction.
Why do people play?
They lack arousal in everyday life. The body needs adrenaline. Therefore, in order to get rid of gambling addiction, you can do extreme sports (parachute jumping, fights without rules, rafting on rough rivers, etc.). You can start dating girls. Street dating is drive, excitement and adrenaline.
If you have a new girlfriend in your bed every night, you will forget about gambling.
Sex with a tanned beauty is much more interesting than roulette.