Gokul Rajaram's framework on defensibility for modern startups, presented on 20VC. He argues the classic moats (network effects, economies of scale) are joined by new ones in the AI era — data moats, workflow moats, integration moats, distribution moats, taste moats, and compound-product moats. For FeatureOS and SupportWire, the question the framework forces is: which two moats are you actively compounding, and which are you pretending to build? See also Compound Software and Craftsmanship.