It gonna be worse when these kinds of young minds are already engaged in gambling, that gonna be possible for early addiction.
This is not the concern because they can earn some money but they are not supposed to be exposed to this thing as gambling addiction could lead them into making illegal activities if they are at the level of addiction.
We should not introduce gambling to young minds but gaming is ok because they can learn a lot of skills here without money involved, but if you put gaming with money involve they will likely lose control of themselves and will find a way to fund their account, let the young enjoy the game with monetary consideration so they can develop their skill, they can learn how to gamble when they are mature enough.
As long as the parent is in supervision , it is ok that children will learn to play strategically , because this will help improve their mind and skills.
But once that they are being let alone ? then this will start the problem as they will surely miss the opportunity to learn and earn with good attitude.
games in internet is tricky and also very dangerous in the mind of youngsters, so best to just let them play when we are around and stops when we are not.
best also to limit the access in internet as this is what I'm doing in our house.
the children is only allowed to access the internet when needed and they will Play physically when its not available.