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This is a very fine line between gambling and addiction for any player, no matter how pro-gamer he is, but that’s why a professional is called such that he can control it. I am sure that there are professionals who, after many years of playing, broke down and fell into the abyss. But if he starts with low limits, then he will be able to rise again if the fall was not fatal and did not cause him severe moral suffering turning into chronic depression.
Indeed, it is a fine line, and it is often difficult to distinguish it. But with our experience, we can know and differentiate it. Yes, I agree with you that there are professional players who end up losing a lot and despair because they cannot control themselves well while they are gambling. They forget that gambling has many temptations, so they seem to underestimate gambling and say they are used to dealing with it. But from underestimating them, they will start to encounter problem after problem, which, in the end, they cannot handle and makes them start to lose control of themselves in gambling. He would feel like he had hit rock bottom again and might not be able to get up again if he didn't quickly realize that he had made a mistake. By realizing his mistakes and the desire to correct his mistakes, he can get back up and start correcting the mistakes he has made.
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Successful gamblers still need skills to be able to achieve good luck. In fact both of these are important roles for truly successful gamblers, and yes, successful gamblers who play based on skills will continue to hone their abilities to deepen their skills so that their predictions or strategies can be right, it is not easy for someone to deepen them. If you are too lazy to hone your skills, successful gamblers will need a long time to get the results they are getting now.
Successful gamblers can be called addicts and it can also be said not, they use gambling to make a profit, which means if they continue to gamble and always win, they can be called addicted because gambling is part of their life. But it can be called no because they can still control it gambling which means an addiction that can be controlled by oneself

Successful gamblers must have skills that can help analyze the gambling they do and to be able to win. They are very different from most gamblers. They also have other things we need to know because they never tell the public. Successful gamblers can play using skills that are above average so that they have a better chance of winning than other gamblers. They will not be lazy to continue practicing their skills because, according to them, that can help them to remain professional gamblers, and they have that when they already have a lot of skills.
Successful gamblers can force themselves not to chase wins because they know it will not bring them more wins. They know themselves better than anyone, so they can defend well and win. We really don't know whether successful gamblers are addicts or they do not have an addiction because they don't show it to the public. But if we can get close to them, we can learn things that help them become successful gamblers so that we can also improve our skills.