What is my moat if I'm building on someone else's model?

The model is not your moat and never will be; the moat is everything you wrap around it: proprietary data and feedback loops, deep vertical workflow ownership, integrations, distribution, and craft. Most great SaaS companies also started with zero defensibility and built it through usage, so "just a wrapper" is a starting point, not a verdict. The pattern that works is going narrow: own one industry's whole workflow so deeply that a general model in a chat window cannot compete.

A quick orientation. The real value is below: resources worth your time, from people who've actually done it.