This is the reason why playing for fun is no different from playing for profit. Both groups experience wins and losses, which makes our brain release dopamine that can trigger addiction.
The purpose is different.
Winning and losing do affect your emotion, but it shouldn't be the main reason to make decision. If you let your emotion to control you, you will end up become an addict. If you play for fun, you won't really care with the amount of how much you win or loss, because you're under control.
Just like the way men control their dick, if we see women in front of us, we have to control it instead of fuck them without their consent. But, it doesn't mean you have to control in your whole life, because you have to release your cum at least a month to reduce the risk of prostate cancer.