Of course, the feeling of regret is so deep that when the gambler has lost a lot of money due to their bad behavior, they will think too deeply and the consequence is that if they are unable to withstand the burden of these thoughts, they will experience severe depression.It is true that if a gambler uses gambling games just for entertainment then he will get pleasure and enjoy every game he plays because he only uses gambling when he needs it, not to make money in addition, money might be played excessively.
It's true that if you gamble only for entertainment you won't have regrets of losing money because you're not gambling to make money but for entertainment. If you lose money from gambling, you shouldn't be feeling regrets as you are the one that use that amount for staking and you should have already known the risk that come from staking money when gambling. You're either going to lose the money or you win money therefore every money that you use in gambling is to be considered lost already so you don't feel regrets when you lose it. Your gambling strategy should have the law that you'll always use money that you can forget if you lose them to gambling and you'll not be gambling with borrowed money or money that isn't yours.
You can still have regrets even if you play just for fun because you may have taken an strategy thinking it would last a long time and would give you a fun betting experience and then find out that is not really that great and will produce excessive and too quick of a loss, which is not what you initially would be aiming for in this case. Also, you may go too far if you do not choose well or lose some control.