Current message kinds are for social networking, but if you wanted online stores for example, you'd have to define a new set of message kinds. Unless you have a k-v storage / graph database. Then you can do nostr.put('npub123/store/items/socks/description', 'Pair of alpaca socks').

A new message kind for products on sale could be a nice idea, that's true. One for offers and another one for requests. These message kinds should then be used by different implementations of online shops (webs & apps). An eventual #nostr-uber and friends could use these same kinds

Yea cause it makes sense to have to open another app to create a community and approve posts. Like?