After all these days, nobody could prove that online gambling can cause addiction. All we have is some kind of assumption because we believe that kids are prone to such a thing, but I say that whether it is land-based casinos or online, we all can possibly fall into it if we can't control ourselves.
As we think deeply, anyone can be addicted to gambling, but the only thing that differs from online casinos is that even those below legal age can gamble. And educating their children is an additional responsibility of the parents.