"One condition to reveal the prize and another to unlock it" is probably a valid trope, even though the description is overly negative. Apparently it's "particularly frustrating" if you're told the Unlockable Content exists after the game begins but before it's unlocked.
However, the "other variations" listed are Moving the Goalposts (variant 1) and complaining about rewards that are in someone's opinion too hard to get (variants 2 and 3). And most of the examples belong in the complaining variations.
"One condition to reveal the prize and another to unlock it" is probably a valid trope, even though the description is overly negative. Apparently it's "particularly frustrating" if you're told the Unlockable Content exists after the game begins but before it's unlocked.
However, the "other variations" listed are Moving the Goalposts (variant 1) and complaining about rewards that are in someone's opinion too hard to get (variants 2 and 3). And most of the examples belong in the complaining variations.