

Did you try these searches while logged in or anonymously? Lemmy (and probably other platforms) don’t allow searches for remote objects unless you’re logged in, this prevents abuse of server resources. The fact that you’re getting replies and you can see them and reply to them means it’s probably all working fine.
I don’t see any Fediverse platforms on there, how would you feel about adding them? Seems like they’d fit.
https://openalternative.co/categories/social-media
Could add Lemmy, Mastodon, MBin, PieFed, PixelFed, Loops, PeerTube, NodeBB…