If someone has already accepted their gambling addiction and managed to stop gambling, it is synonymous with willpower.
But the paradox is that if you have the strength and conviction to stop gambling, anyone could come to the conclusion: "Why not just control it and that's it, without needing to quit gambling completely?".
Which brings us to this questions:
Is it harder to control gambling or limit it without falling into excess than to stop gambling forever?
Why is the effective strategy not moderation but absolute abstinence?
There's a saying that goes as this, once a gambler always a gambler, meaning that it's hard to stop gambling which is why a lot of people do their best to control it and keep their addiction in check. You don't have a problem at all if you are gambling moderately, stopping gambling forever can be a lot of work but if you work on having limits and controlling yourself you would learn to gamble responsibly and cautiously