It seems like if what you’re showing is what you understand they find appealing and fun, then surely that’s what should be in the game. You give them that.
But instead, you give them something else that is unrelated to what they’ve seen on the ad? A gem matching candy crush clone they’ve seen a thousand times?
How is that model working? How is that holding up as a marketing technique???
Don’t know if the others are correct about the reasons, but here’s what I felt to be a reason when I once installed such a scam. They do whatever they can to make you run the game and then try to hook you up by using every trick possible to increase engagement. Then they sell you worthless in-game resources for real money. The game I played didn’t even have ads aside from ads of purchasing in-game stuff everywhere