An example of unregulated market is where I come to your house and put a gun to your head and in exchange for not pulling the trigger you give me your various items of value.
That's one form of trading with your neighbor.
While you are technically correct, you are neglecting that it would a be a bad idea, because in such a market I would likely answer the door with a shotgun or I would have an agreement with my other neighbor to shoot you if you come to my door brandishing.
This is actually also how global diplomacy works. Either have big guns or big friends.
I think you have gone in the end of the spectrum, in a sense that even a state law's are being broken, we are talking about rules in the market itself.
An unrelated market is an oxymoron. You could come to my house and put a gun to my head, but that's not a consensual trade. That's just thuggery; the point of a market is that both sides benefit from trade.
For markets to exist, property rights also need to be respected.
Username checks out
Edit: upvoted because it's true
If you're relying on threats of violence to make your trades then you've become the regulator.