The moat
Brand, shelf space, and scale in advertising and manufacturing. Switching costs are habit and slight performance edges. Private label is the long war.
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.