Two of the ten categories told me not to build: one had nothing wrong with it, the other cannot be built

Promised follow up to the review pull. Eight of the ten categories gave me a product brief. Two gave me the opposite, and they failed in completely different ways.

The one with no gap. A party game category. 98 reviews pulled, 4 of them low star. Four. The two leaders sit at 4.72 and 4.78 stars on tens of thousands of ratings, both shipped last year, and the only two complaints in the whole set are about billing rather than the game. There is nothing to fix. Everything I could write down as a differentiator was already there.

That is a genuinely useful negative result, because the demand signal for that category is excellent. Downloads, revenue, momentum, all fine. If you only look at demand you walk straight in with a better version of something nobody thinks is broken.

The one that cannot be delivered. Hidden camera detectors. The complaints are not about polish, they are about the promise: "I put a camera in my own room deliberately and it did not find it." "Held it up to my own camera, it flagged the metal hinge on the wardrobe at ninety percent certainty and never saw the actual camera." "Thought my motorcycle wheel was a lens."

The reason this one is a trap is that users test it by hiding a camera and asking the app to find it. An honest app that correctly says "I found nothing" fails that test and collects the same one star. The category's promise is not something phone hardware can keep, so quality is not the axis you can compete on.

One survivor next door, though: the tamper style apps that photograph whoever picks up your phone. Those complaints are specific and fixable, which is the difference.