During my time, this principle was followed. With one small exception: Amazon Marketplace. There everybody was extremely hands-off, at best the marketplace sell

During my time, this principle was followed. With one small exception: Amazon Marketplace. There everybody was extremely hands-off, at best the marketplace sellers were considered Amazon's customers, not the people buying through the marketplace. That being said, if sellers used FBA, things like returns and so on followed the same rules like Amazon's own business. I didn't really agree with that approach, but it does seem to work out quite well for Amazon so far...