They say prevention is better than cure so I guess the best low cost or zero cost solution to gambling addiction is the conscious prevention of oneself from falling into gambling addiction. It doesn't take much all it does take is self discipline, being in charge of your gambling habits and with a good money management.
However, for such a person that has already falling into the addiction and intentionally wants to kill it talking to people about it and engaging them into discussion about possible suggestions on how you can be able to deal with the addiction and this suggestions you make sure it's coming from people with a real life experience of gambling addiction. Then ones in a while the addict can also seek the service of a professional therapist too. In this way you can cut cost while achieving a lot.
If more gamblers realized that they needed to prevent themselves from falling into gambling addiction, many problems in gambling could be solved, and the number of people who are addicted to gambling could increase. But the problem is that these people don't want to realize what will happen to them if they become addicted to gambling. They only think about making money quickly without thinking about what the risks are for them. There is no self-control, boundaries, or self-discipline in gambling, so they only make themselves fall into gambling and become deeper into their gambling addiction. This needs to be addressed immediately, and people who are addicted to gambling must be willing to admit that they are addicted to gambling and need help to cure their gambling addiction.
They need help from other parties, and if there are family members who know that they are addicted to gambling, family members can start helping them by taking them to experts. They must accompany people who are addicted to gambling so that people do not feel alone in fighting to cure their gambling addiction. He will see that there are members of his family who are also fighting with him, so this will encourage him to be able to persist through the therapy process.