Well, they could be at risk IF parents won't be able to properly guide them as they are being exposed to such games or activities. Atleast it is safe to say that on these games, children are eyeing to win toys rather than monetary rewards(yes it have the same idea but money for sure is a different drive as a reward). If you are a parent already, you know that it would be hard to monitor all of the things that may cause risk to your child given that you won't be around him all the time with places he/she is going into. Parenting on this instance will keep them safe from ideologies of addiction and bad influences. Make them aware of the consequences of their actions and the activities they are being hooked up to.
I am not want too much trouble by this because I believe that even the local mafias are involved on this, but in some book I read that the economy is going to be a mess when gambling are in every street of the country.
I will suggest before you can raise any concerns it's best to understand your country law if gambling is permit or are legal before taking laws into your hands. However, I don't still encourage such acts by allowing kids to play gambling in mall or at the shipping center because already it's gradually ruining the future of those kids as I know gambling from childhood doesn't give any support or form of good governance to the kids who's involving them to gambling as it may utterly destroy their life whereby creating loopholes in their lives about gambling addiction.
These games on the example are the ones which are on amusement parks or in malls. These are just games which are safe from children but if it is with the idea of gambling then yes there's a potential risk in the long run but it is still manageable given that these are young ones we are talking about. Well, atleast in my perspective.