This is not the only kind that can ruin you. There are people who win big and stop playing, but they do some very stupid things with the money. Overprices phones, clothes, cars, and such things.
That's true. Some people even get drunk or high on drugs because they won big. I know of a sad incident where someone won big and went out with his friends to celebrate. They got drunk and one of them lost control as they were driving back from a nightclub. They had a fatal accident that led to the loss of lives and some injuries. Over-celebrating one's win is also not appropriate.
That's one of the worst cases, just terrible. Every now and then something extremely bad like that happens. It is sad because the right thing to do is so easy. When you win big, you are supposed to do nothing. Do not play, do not spend, do not do anything for some days or weeks. You can use this time to think, investigate, ask questions to people who already have been through this, read stories about it.
The problem with winning is that some people don't know where to stop, they keep chasing after more wins and this can be the reason why they start losing... after winning from a casino game or sports game I give myself a break maybe one of two weeks so that I can spend the profit on important things. If you get trapped in that cycle of greed it would only make gambling addiction worse..learn to take a break after winning
It is not just this, there is a lot that can go wrong after you get money even if you don't play anymore.