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???
This was my thought as well. A lot of these games are never made, even when the ads do very well (as evidenced by the ad continuing for years). Someone actually made the bait game for real, in recognition of the fact that the games have been advertised for many years and never made.
Even if OP’s explanation is sometimes correct, it doesn’t seem typically correct. In fact, it seems like a rare edge case, at best.