I'm only aware of open bazaar but with open sea, why it is on number 1 on your article? And the same goes for the origin protocol. I don't know these marketplaces that you are suggesting.
Why not include the forum's marketplace categories? there are a lot of trades that's happening there.
A marketplace is a place where you can exchange crypto for products. Don't think about it as a place you exchange cryptos as that is more of an exchange concept.
Opensea - You can purchase ERC-271 tokens (items on the blockchain)
Origin Protocol and Open Bazaar - You can get items for your crypto.