Neither wins nor losses lead to gambling addiction. Disorder in betting is caused by behavioural problems. If you have the mentality that a winning streak shows your mastery over the system, you might start gambling excessively. You can also have problems if you assume that you can chase losses and recover all you have lost. If you gamble for fun, I don't think you will chase losses or gamble more than you can afford to lose.
You are disapproving in one sentence and approving in the other. Both losses and wins are catalyst that leads to gambling addiction. What do you do and how do you feel after some winning streaks? don't you feel the urge to try again, maybe this time with a bigger amount, while greed is part of what propels a gambler to pursue more wins, winning consecutively can feel like a good luck charm, leading to extreme gambling addiction. Most gamblers are not okay settling with their bet whenever they lose, they keep in mind that next one might be the lucky chance they get to win and cover up for other losses.