> The real problem is that players are getting tricked into installing a "free" game but later sucked into gambling once they're invested and addicted.

Not to say these gambling mechanics aren't reprehensible but you're focusing on the wrong thing. There is no "tricking" involved; games with in-app purchases are clearly labelled and gambling-like mechanisms are so standard now that it would be more surprising to find a popular game with IAP that _didn't_ use a gambling-like mechanism than one that did.