When you win, you think that you know gambling better and assume that luck is on your side, which leads you to jump into a big risky bet. You start losing, and at that stage, you change your mind to recover the money that you lost and start chasing it, falling into the trap. All your winnings and original money are gone, leaving only regret and sadness on your side.
I agree that winning can ruin you too because there is no lesson to learn when you win. There is no moment of sober reflection to sit down and think of what you actually did right and what you can do better period this is online when there is a loss that causes you to sit back and think for a while while the loss happened and what can be done to avoid it the next time. In thinking about this particular one you start to talk about how you manage your risk next time and a better strategy to use.