This is one awesome example of nostr usage that isn't a direct copycat of some existing product:
https://github.com/shocknet/Lightning.Pub => Pub enables your Lightning node with public Web API's over nostr, allowing user nodes to act as a server without complex networking and SSL.
Basically just way better networking to have accounts on a Lightning node without worrying about a shitload of firewalls and security shit. These guys went through the Wolf accelerator in NYC and they're the real deal.
Web relays and nodes as architecture, json over websockets, decentralized and censorship resistant architecture is fucking awesome. The potential is way bigger than some shitty version of a current existing app. Shocknet's Lightning.pub is a great example (and I'm pretty sure they use it in their platform Lightning.video).
Nostr is a protocol and the potential is awesome
However, the products built on nostr currently include a fugazi twitter, fugazi medium, fugazi podcasting platform, and pretty much everything else that's a direct copycat of some existing platform with an existing network effect but now you can zap people. If that is not interesting to you then I don't blame you.