Oligopoly _specifically_ describes what we have here. I learned a new word today.
From your link: "the exclusive possession or control of something", "a company or group that has such control".
You must be trolling.
I'm not. But I do find it interesting how some people here don't like certain definitions and claim they are wrong.
You claim our definitions are wrong as well!
You're describing markets the ways journalists are joked[1] about describing guns. Except you're doubling down and saying "No, you're wrong. All assault rifles are AK-47s, everyone knows what I mean when I say an AK-47, you know, a gun that shoots bullets fast and stuff!"