When you gamble with the hope of making money, you realize that gambling is not as easy as you thought. Because those who gamble with the hope of making money and lose after spending a lot of money on it, do not just lose once, but when they keep losing, it seems that gambling is not easy. In fact, it did not seem that easy to me either, because I spend very little money on gambling and I do not gamble all the time; I gamble only in my free time and when I feel like it. That is why I do not regret gambling much. But yes, nothing is easy, of course it is difficult. When luck is with you, it may seem easy to you.
This same hope is exactly why those gamblers keep coming. They lose once and think that it was all a fluke. The second time, the same thought and then after losing a large amount, they accept that it is difficult, but instead of quitting, they will switch to "oh, if I keep gambling, I might be lucky to win back what I have lost", and that usually leads to more losses.
The sooner the gambler accepts the fact that gambling is difficult and not something you can just enter and succeed if you're not lucky, the better for them.