Winning is not the problem rather greediness is the main culprit that makes you pursue more to bet when you are already in profit.
I personally don’t view winning with negativity despite the example involved since I knew that it’s not the winning but greed. Losing or winning greed is the common factor why people lose in gambling.
Your view on this is correct, winning isn't negative but what you do next would determine whether you would have a negative or positive result...some gamblers win and the next thing they think of is to try again, this is just as a result of insatiability and greed... winning comes with an excitement that if not properly controlled it can make you get carried away... That's why it's important to be in control as as a gambler