I think that everything starts with thoughts. Let's say some newbie gambler played gambling and even won, for example, he was lucky and doubled his deposit. This happens often, but few can maintain this success. Well, such a guy will most likely start thinking that he got it all easily and now he can easily repeat such a win again. He is already mentally thinking about where he will spend the winnings.
And as a result, he returns to gambling with inflated expectations of winning.
But according to the theory of probability, he is no different from thousands of other players who have now come to play in an online casino. And therefore, he most likely will not be able to repeat his success.