I don't have any data but I think it's safe to assume that people with gambling addiction problems are prone to play slots/pokies instead of black jack & poker (as in traditional poker while ignoring online poker).
We both accept parents have a responsibility to monitor their children's activities online but in reality, it doesn't always happen.
I can't place the blame solely on parents either when Apple guidelines state these games are suitable for ages 12 and up. You could almost forgive parents for taking Apple guidelines at face value.
The cocaine example isn't that different considering compulsive gamblers also have a disease. My point was that children don't need to experience something personally to learn it's a bad thing.
For you, gambling is about managing risk. For me, it's the occasional flutter for a bit of fun. Winning, fun etc has nothing to do with it for a compulsive gambler.
I don't have kids but when my girlfriend and I start a family, I'll do my best to prevent them from playing games such as this nor will I allow them to use these devices until much older when they won't require 24/7 supervision and some trust is established.
You're right that we don't have enough responsible parents in the world and if they want to gamble, it's their right to make such a decision. What I take issue with is companies such as Caesar's Entertainment taking advantage of this lack of parental supervision to line their coffers.
With Apple facilitating and taking a 30% cut of the earnings, they're complicit in such shenanigans.