Pictures like this shouldn’t be taken as a play, most people that are really desperate to make money from gambling will take this picture very serious, so pictures like this are just encouraging addiction in gambling, and it should be avoided, this is a way in which addicted gamblers are encouraging themselves, when you visit a gambling shop in my country, you are going to see gamblers motivating themselves like that.
If people could ignore it, they would not feel hopeless, would look for other avenues, and would not use gambling to make money. They know that gambling is just for fun and not a place to make money. They will also realize that if they play more often than before, let alone use too much money, they will experience a lot of losses and will not be able to recover their losses. And yes, that is what people will do to return to gambling because they think they are just a little away from getting their big win, even though it won't happen as easily as they imagine. They have to really see and realize that gambling is not a place to make money but just to have fun in their free time.
If they have that certain control from their emotions then it's really okay for them to gamble as they will not resort to gambling as source of finances but instead a venue that they can find enjoyment, there are people who are engaging to gambling with high aim to win big, thinking that with that mentality they will manage to win and can continue taking money out from the gambling house.
Just like what you said, gambling for fun and not to exceed will keep you away from getting addicted, gambling irresponsibly though will bring you to a big trouble and it will lead you to addiction.