The moat
Brand and scale in endorsement. Switching costs near zero; demand is taste. Distribution muscle remains. Moat width is currently an empirical question, not a slogan.
Pain, risk, or retraining required to leave.
The product gets better as more people use it.
Patents, data, licenses, process knowledge, regulation.
Fixed costs spread over a volume rivals cannot match.
Structural ability to be the low-cost producer.
Pricing power from trust, habit, or identity.