It all depends on each person's perspective and point of view on gambling from the beginning he was involved, there are many factors that trigger interest at the beginning, starting from being interested because gambling is fun to do in your spare time or interested because there is a chance to win, so whatever developments will occur to a gambler that leads to their approach to gambling depends on how their perspective is from the beginning.
Yup, it's on you when you step your foot into gambling, how you percept the possibilities and how you treat your participation, the development depends from how you control your emotions, there are some who start as entertainment then ends up getting to deep and become addicted, whatever the age and the level of understanding once you exceed from your set target then you are already prone getting addicted.
Yes, I think that's the point, what I mean is that everything a gambler will do will definitely depend on how they see the activity from the start, simply put, if from the start they misunderstand in the sense of seeing gambling as a place to earn income, then all their actions will tend to always lead to excessive aspects, and this is also one of the reasons why it is always difficult to give them advice because after all they will only listen to themselves, in fact it will be very difficult to convince them that excessive gambling will actually lead them to many dangers, they will never come to that thought because their thoughts are controlled by an obsession with winning.
But on the other hand, what you said is also true in the sense that even though from the start someone comes with the right understanding, it does not mean they will continue to be like that, it is very possible for them to eventually experience changes, especially in terms of their way of thinking and perspective considering that gambling is full of various things that look tempting, and in my opinion to minimize it is you must always be able to maintain awareness in yourself every time you play.