To save your friend from gambling addiction, you must behave in a friendly manner to keep him away from gambling. Although it will be very difficult to keep him away from gambling at first, try to keep him away from gambling as far as possible, whether through entertainment or sports. Even if he participates in gambling he may be allowed to use 1% to 2% of the maximum income but I think it would be better to keep him away from gambling completely.
Because you actually gave a good suggestion. If we talk about some of the worst addictions in the world, then gambling assets will be on the top list. And those who once become addicted here find it very difficult to come back and that does not bring any improvement in their life. And I think the people around him should come forward to save those people from destruction and for that friend can be the closest.