But there are certain Nostr apps like nostr:npub1zach44xjpc4yyhx6pgse2cj2pf98838kja03dv2e8ly8lfr094vqvm5dy5's Flare.pub, and Nostr-adjacent apps like nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 that don't even publish their comments to the global feed, as far as I know. In the case of Flare perhaps that's a NIP thing.