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Centralized services enables commerce at scale

No, that's retarded. Centralization is a cheat code to UX perhaps, but not scale.

web of trust grows just like the silk road, alphabay, airbnb, and coinbase

Web of Trust is the reputation of any given participant.

SR and that other shit are not Web of Trust, they're individual participants, the reputation they give to a seller is only in THEIR view. They themselves are an individual participant in an open market for any number of things.

You can rent a vacation house from countless places, you choose AirBNB because of your trust in them as an escrow and their rankings of others.

Now imagine a decentralized AirBNB, where who you rent a vaction house from is based on people you actually know leaving reviews for owners they rented from. Perhaps a new property comes up without a reputation, you don't trust the owner, so you and the owner agree to have a mutual connection escrow.

but the point of a darkweb marketplace is that there's some trusted intermediary that reduces counterparty risk

That's an escrow. Any market built around a centralized escrow will fail.

silk road acted as trusted custodial escrow systems in order to facilitate trade

Yes and that was fucking stupid.

even a darkweb market that supports Lightning today?

Telegram, Signal, Nostr... WooCommerce... anything that facilitates encrypted comms on the internet.

The idea a "darkweb market" is a centralized thing is moronic LARP. Completely wrong mental model.

How long could you operate a large Lightning node for the purposes of facilitating commerce on the scale of the silk road.

There are countless large lightning nodes and LSP's doing a ton of volume, what that volume is for nobody knows. That's the point. Every user uses them differently.

As a buyer or seller, you can connect to as many of them as you want... or a s few as you want. And as a seller you never need reveal your node to anyone, as a buyer nobody knows who you're paying or what for.

Wouldn't it be trivial for the feds to take down the node and loot the funds?

They can arrest certain actors, that's why decentralization is all that matters. If you dox yourself doing something stupid that warrants their attention then yes they'll come to your house, break your shit, and coerce you into giving up your keys... but you're just one participant in the market, the market itself will endure.