These advantages exist for mass retail. The medium-sized businesses who tried to compete with Walmart and Amazon had to adapt fast or fail. These advantages do not (EDIT: have not been shown to) exist for commercial real estate; WeWork was a dud. Most American commerce is, and should be, in the hands of these medium-sized businesses, if for nothing else than resilience and local optimisation.
My worry is the advantage of centralising customer data is too general. That lets a single entity exert broad scaling advantage, which is scary and inefficient. I increasingly think this should be a measure for antitrust enforcement: does a company possess an edge that gives it a competitive advantage in almost any market it tries to compete in. If so, it’s an economic nerve bundle and at the very least needs to be regulated.