There are already topic-based clients
https://jumble.imwald.eu/discussions
You can also see Kind 11 the Android client from
https://zapstore.dev/apps/naddr1qvzqqqr7pvpzqlxr9zsgmke2lhuln0nhhml5eq6gnluhjuscyltz3f2z7v4zglqwqqt8gmm0d3ejuun9d3shjtnjv4kxz7t5dahkcucqxkt5u
Silberengel
npub1l5…egx9z
2026-02-01 17:15:56 UTC
in reply to nevent1q…5clq
Author Public Key
npub1l5sga6xg72phsz5422ykujprejwud075ggrr3z2hwyrfgr7eylqstegx9z