The moat
Brand, store density, and loyalty program switching costs. All three still exist and are narrower than the 2010s narrative claimed.
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.