The mistake is thinking your startup idea is venture-scale and getting on the VC treadmill. Once you’re on the treadmill, here’s what changes:

1. High growth expectations: VCs are looking for companies that grow big enough fast enough. If your business isn’t suited to this kind of rapid growth, it can lead to undue pressure and unrealistic expectation

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Why do so many founders build things no one wants? Because they begin by trying to think of startup ideas. That m.o. is doubly dangerous: it doesn't merely yield few good ideas; it yields bad ideas that sound plausible enough to fool you into working on them.