I agree, but the kids will try to search what is gambling, and if they find it by coincidence, I think they will try to play. The kids will have a big curiosity about something that they don't know, and they will search more and more until they found it.
I guess they will not ask about that, but they will search what gambling is, and if they see that playing gambling is excited, they will try to play. That is what the kids do, but some kids will ask about something that they don't know as that is what my nephew asked me about some games that his brother played on his computer.
I think that is a job for the parents or adult people around the kids to tells about gambling, what is the advantage or disadvantage so they know why they should not trying to playing gambling. I think if we can say or teach about a good thing and also tell about the wrong side of something, they will feel that they should not do that bad thing. Perhaps, it's like mental training or planting into the subconscious about something that can give bad things.