I only want that deal if I could also snap my fingers and get network effect for this application. In that case it would be some Nostr-Lightning-backed marketplace for all sorts of goods used and new.

If I can't get network effect, then I don't know, everything is useless, maybe a super good online multiplayer game that also happens to use satoshis for buying and selling clothes so all adolescents are forced to install https://sbw.app/ to do their shopping.