It's true that winning or losing has nothing to do with addicts, but that's one of the causes of becoming addicted and you yourself said all this is just about mindset.
so this is how a beginner gambler comes to gambling playing a slot machine after 10 spins and gets a maxwin win and that's when the gambler has the mindset that it turns out gambling can give him money and he will continue to think about the win until the time comes when he comes back again to play slots and losing then depositing again until the time comes when he loses all the money in his pocket while his mind is still curious about his defeat and has additional thought patterns such as being sure to win after losing and continuously making deposits using borrowed money and finally the first signs of addiction have started.
on the one hand, losing can also be the cause of someone becoming addicted for beginners but the potential is not as big as winning except for a beginner gambler who has the idea of wanting to get a big win after seeing his friend win big and starts gambling even though he is losing he keeps trying until the time comes when he loses it all and become addicted to chasing losses.
All newbies in gambling will always had their first win or lose, and each of these result can still lead for them to become an addict in gambling, if they will let their emotions consume them. As a newbie, their desire is still strong but I think they can't immediately become an addict. For it to become one, they need to have a lot of sessions and wagers first.
So, there is still a chance that they can change their direction, just like to the most of us. We realized later on that being addicted in gambling will only do nothing good to us, especially in the long run. What we talked about here must be the same as beginner's luck. Indeed they shouldn't believe about it, so that they will stop trying and losing more.