Very well said, that's how human psychology is, we start doing something only to have some fun for only a small period of time, but as time goes on, we start increasing that time instead of leaving that thing, and when we keep going and increasing the time or the resources we spend in case of gambling it is money, we don't really realize what we are getting ourselves into until a time comes where we have already reached so far that it is almost impossible for us to return.
Filling their boring free time with gambling, they do this only for a short time but most of them forget the way back because they have had fun and they want this thing to last longer. Something fun will turn into a hobby for happiness. They had started it and they loved it, there was not the slightest bit of boredom because they had placed too many hopes for a victory so it was difficult for them to find their way back.
The same thing happens when we start gambling, we don't want to get addicted or gamble for addiction, and most of us might just gamble for fun initially, but as we get deeper into it, we start increasing our stakes, the money that we spend later will be way higher than what we have started with, and slowly, we get addicted to gambling.
Someone who has started gambling even though it is on a trial basis means that he has agreed with himself that he will not mind if one day the feeling of addiction comes over him. The self-control factor will not have much effect when someone is already addicted. The finances in his life will definitely fall apart and if someone is in this position, they will never feel a calm psychology.