"Buyer" or "seller" is interesting since it makes a functional distinction. But "Customer" or "user" is just a word choice without an inherent distinction. The

"Buyer" or "seller" is interesting since it makes a functional distinction. But "Customer" or "user" is just a word choice without an inherent distinction. The way either word is used is very heavily dependent on corporate culture. If a company uses "user" in an cold, impersonal way, it's guaranteed they'll use "customer" in exactly the same way.