This is going to be a bit long but hope it answers your question...
bolt.fun is a client that has a specific purpose. Knowledge sharing and community of builders and designers. We have two types of feeds on the site. Our own built in Story feeds which use a traditional database + various Nostr feeds where we do filter certain kinds of content that we fetch from other relays. We're experimenting with something called a "Community Relay" - since the global Nostr content won't be so relevant.
Here are some examples of where we fetch events from Nostr that fit a specific criteria.
**Nostr Devs + Nostr Design**
\- https://makers.bolt.fun/t/nostr?feed=nostr
**Folks on Nostr from the bitcoin design community**
\- http://makers.bolt.fun/t/bitcoin-design?feed=nostr
**Hackathon participants who use #NostrDesign in their nostr posts externally**