Isn't this a network effect problem? For local, why would sellers choose this over the reach of Facebook Marketplace or Craigslist? For buyers, why would they g

Isn't this a network effect problem? For local, why would sellers choose this over the reach of Facebook Marketplace or Craigslist? For buyers, why would they go to an unknown app with little inventory instead of one of those sites or a local kids thrift store? For delivery, it seems like ebay already does all that and has a mature stable reputation, payment, and refund system. "Kid stuff" just seems like another generic category alongside "outdoor gear" or "used elefteonics" or whatever that any of the big players already accommodate using their existing platform. Meanwhile you're trying to build a new platform that does pretty much the same thing, but with a much smaller network of sellers and buyers. Why should anyone use it?