That’s really cool - personally I wish they’d support existing projets like the amazing https://inventaire.io

In Germany there’s Tauschticket where you offer the stuff (books, DVDs, games, etc.) you don’t need anymore for up to 20 “tickets” and once somebody wants that, you send it to them (at your own expense) and get the amount of tickets added to your account. With these tickets you can then “order” stuff from other people in the same way. Similar concept without the hubs.