Gambling before your children is very similar To stealing or having sex before them because they will learn more than you And will like To try it with their peer groups in School especially in the Hostels. Try So hard To Create positive impact before your children , teach them How To be investors , Train them on How To trade crypto And hodl some coins for future purposes, And lastly teach them How To be positive Minded in whatever they do.
I don't see gambling in front of children as bad as you have described it here. Stealing is too harsh to compare to gambling; stealing is forcefully taking what belongs to others; gambling is not that way.
I know it's not that healthy to gamble in front of your children, as it could have some negative impact on them, but you can still control that and put them in the right place. But when it comes to stealing or the adult thing you mentioned, it shouldn't be compared at all.
One thing about parenting is teaching your children the right way to go and for them to have basis knowledge about things you think are very necessary, and it's left for them to decide which step to take from there.