I agree with you, I think and don't find any benefit for children if they see gambling being done, I don't think there will be any benefit, if they think it's a talisman I don't think it makes sense because winning at gambling is more about individual luck. So, if you really have luck, you will win under any circumstances, and no matter what you do, you cannot guarantee that luck will be on your side.
Even though online casinos do not have an age limit, of course parents will not allow their children to gamble even if they are born into a very rich family because gambling is not something that should be learned either for example, there are other people who gamble and there are other people's children, I don't think the people who gamble will show the gambling they do, therefore if there are parents who gamble and allow their children to see it it is probably the parents who have taught them wrongly even though they have good intentions behind it I don't think it makes sense.
My grandma played cards with me when I was a kid. My father explained me rules blackjack and poker rules when I was a kid. When I was a teenager, I remember we had a VHS cassette with comedy movie
Maverick (movie about poker tournament). I remember I we had challenges when we were kids and used chewing gums as currency for bets. Somehow I managed not to grow up as gambling addicted. Miracles, isnt it? And from your post, it is considered that my parents were bad at parenting. In fact, my kid saw me gambling, knows rules and what it is. That also makes me a bad parent, right?
However, none of those who surround me, ever used gambling to earn, never boasted with amount won or that gamble. It wasnt accepted in our family. We usually celebrated achievements in studying and promotions or success at work. Gambling was never a source of income in our family. This is probably why we all have such entertaining attitude to it.