Why the Market Lives on an Onion
A darknet market is on an onion address because the address is the protection. It hides the server, it hides the visitor, and it changes when either one is under pressure. Here is what the onion actually does, what it does not, and why the address moves more often than a normal domain ever would.
What the onion protects
An onion address hides the location of the server behind the Tor relays, so the market is not a single point that can be found and seized. It hides the visitor too, because the traffic routes through the relays before it reaches the service. The address is the layer that makes both of those true, and it is the reason a market can operate without a fixed, findable home.
What it does not
An onion hides the route, not the endpoint, and it does not protect a balance you hold on the platform. It does not make a bad vendor good, and it does not stop a lookalike from copying the storefront. The onion is the network layer, and the rest of the security is the escrow, the verification, and the habits, which are separate things that have to hold on their own.
Why it changes
The address changes because it can. A new onion is a clean start, free of the load and the lookalikes that built up on the old one. The rotation is the market shrugging off pressure, and it is the reason the set moves while a normal domain stays put. The cost is that the buyers have to keep up, which is what the directory is for.