What's interesting is that we've decided to define gambling according the rules of the game—in reality, "gambling" is probably more akin to a psychological state that can be induced by many different rulesets and experiences.
Mobile games today are largely thinly-veiled attempts to induce this state in children through various Skinner Box mechanics in order to get at their parents' wallets. Fine.
But the real question is: what happens to the mind of an eight-year-old if they have a gambling simulator in their pocket every day? What happens to their neurological development after five years of exposure to this "gambling" state?