The rented layer
A brand that sells online typically pays three ways: the platform's monthly fee, a stack of apps that each solve one problem the platform can't, and a percentage of every order on top. Each app keeps its own copy of the customer, so the same shopper is five different records in five different tools, and the questions that decide the year, what actually earned money and what actually cost it, get answered by exporting spreadsheets and guessing.
Ownership changes the economics and the answers at the same time. Catalog, cart, checkout, accounts and reviews run as your own code in one system, so every module sees the same customer and the same order history, and the app subscriptions stop. When you want to know what a product really returns after discounts, returns and app fees, you ask, because for the first time one system actually knows.