I think it would be very unpopular. I have no idea what this has to do with my point about protecting children being more important than taking the moral high ground against their parents.
It's the same thing, if you want to protect children and that's the most important thing then alcohol is a far bigger target than gambling.
I wonder how many anti-gambling people love a drink. And how many of those people would change their tunes once someone said to ban something they like.