I thought I had a great startup idea. It was niche, but a solid global market. It was unique. There was a genuine pain point being solved. My MVP solved it. The pricing worked, the tiers were sound.

At least ChatGPT, Gemini and Claude told me it was. I did so many rounds of each one evaluating the other, trying to poke holes etc. Reviewing the idea and the "research", the reasoning. Plugging the gaps.

Then I started talking to real people about their problems in this space to see if this was one of them. Nope, not really. It kinda was, but not often enough to pay for a dedicated service, and not enough of a pain to move on from free workarounds.

Beware of AI reviewing AI. Always talk to real people to validate.