A marketplace without allowing users to send payments to each other on SN feels like a missed opportunity, but it would allow us to not have to escrow and deal with order status stuff.
You can have a digital goods marketplace where you do use LN on SN, but for something that needs in-person delivery, I can see this being very useful. Heck, there are plenty of people that want to trade cash for BTC or vice versa, so that alone would probably be a big value-add.
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A simple non-custodial buy/sell sub would be a good start (Craigslist works well with this structure) then could add built-in payments, order management and escrow in the future if needed. Bitcoin needs more P2P marketplaces, so this could help a lot. :)
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