Gambling only because a problem of addiction if one allows it to be. It's almost the same with how other forms of addiction work so that's why I agree that even constant winnings can contribute indirectly to the addiction. One mentality that fuels gambling a lot is the fact that in gambling, you can only lose 100% of your money but you can win as much as 1000x worth of profit.
If you do it long enough to convince your brain that it's a need must situation, then it becomes an addiction.
Gambling addiction is so strange that I have also noticed that those who gamble become more interested in gambling after winning and are pushed towards addiction. On the other hand, it is also seen that those who lose play again to get back their lost money and become addicted. So this shows that gambling is the cause of addiction in both winning and losing. If you are motivated by gambling and play constantly then I would say that you play for a short time and only in your free time when you are free to do nothing. Yes, this is also coming back if you gamble you will not even understand when you will lose all your money and you will not even realize in which direction you will win it is quite strange. So I would say that if you do not control it if you become emotional then gambling will be a huge addiction.