[izacus]

Amazon itself is in hot waters for antitrust, so perhaps you shouldn't use them as an example.

Still, there's a giant difference - Amazon's "customer pool" isn't forced to buy only on Amazon and Amazon doesn't force YOU to ONLY sell the same item to that "customer pool" (I like how you use a term that makes people seem like inanimate objects.) via Amazon.

This is a massive difference. All the benefits of free market (as opposed to command economy) are derived from customers being able to freely choose another vendor and product to purchase. Monopolized integrated services are just a corporate version of command economy where a single actor dictates pricing and eliminates competition leading to severe lack of innovation and worse products for everyone.