Yes, rich people can afford to gamble with large sums, but this does not mean that their gambling is more justified or "correct". Like anyone else, they can experience good or bad luck. The problem is that for people with limited funds, losing even a small amount can lead to serious financial consequences, so it is important to realize that bets should only be made with free money that a person can afford to lose.
With those who are rich, they may be able to bet more freely because they have reserve funds, but using reserve funds to gamble, I think, is the same as excessive gambling and yes, excessive gambling is not recommended, setting limits on funds allocated to gambling is something that must be done, for some people this is still a difficult problem to implement.
I agree that the money that is bet on gambling must be money that is not for other purposes, and before that they must know that they will lose money more often than they get money, they must also be prepared to lose the money they bet, that's why many people say you have to gamble with money that is in accordance with our own abilities.