The moat
Brand, secret-formula mystique, and an unmatched fountain/cooler distribution system. Efficient scale in many markets. Switching costs are habit, not lock-in.
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.