Fun of gambling because we can play. Gambling is fun because gambling game that is very interesting in my opinion. Such as dice, poker, sports betting. Bitcoin I played when I was in need of comfort. Perhaps fun is in gambling because gambling is a game.
And this game becomes basically your enemy when you're starting to lose your money. It's fun if you know how to play, and the only thing you should know to do is controlling yourself. If you can manage to do that, you're saved and you'll be fully entertained.