A lot of the ads basically go along the lines of: 'you could win big and have a great time, awesome! (disclaimer: will probably ruin your life)'.
It should be like it is with smoking - photos of lung cancer patients on the package. People will still do it of course but at least it's not falsely advertised.
So the gambling ads should be things like, that moment where your wife finds out you've drained the family's savings and the house is about to be re-possessed. Yeah.