It doesn't really matter whether it's for entertainment or whatever their goal is in gambling. The problem is usually the inability to accept losses due to excessive gambling, even when you're gambling thousands of dollars. As long as it's within your reasonable financial limits and you've allocated it well, it's not a problem because you've calculated how much money you can responsibly lose.
Gamble within your means to lose beyond your means. People continue gambling more often because they want to recoup the money they've lost in previous gambling.
I have also noticed this in myself, that at first everything is perceived as fun and to play a little, but then we fail to win and even lose. Because of this, I just want to return what I lost and it starts to spin like a funnel, we are drawn more and more into the game because of this. But you need to develop the most important skill in yourself, not to cling to past losses. Today I have already learned to do this, but earlier because of this I lost quite a lot and most of my deposit. It is better to learn this sooner than later, which will allow you to save at least a little.