What is the difference between selling on a marketplace and your own website?
On a marketplace you rent access to an existing audience: Amazon or Flipkart brings the traffic, handles discovery, and takes a commission plus fees on every sale. The customer belongs to the platform, not to you. On your own website you own the storefront, the customer data and the full margin, but you must generate every visit yourself through advertising, search or social. One is distribution you rent; the other is an asset you build.
A brand launches on a marketplace because it works immediately, then discovers eighteen months later that they have built a business with no customer list, no repeat mechanism and a margin that leaves nothing to reinvest. That is not an argument against marketplaces. It is an argument against treating them as the destination.
The honest framing is that these are not competing channels. They do different jobs. Marketplace answers "how do I sell something this month". Your own store answers "how do I still have a business in three years". Both questions are real.