Threads' federation is already using a deny list. And Authorised Fetch.
Soapbox lead developer, Alex Gleason discovered, that at least 5 Fediverse instances are blocked by Threads. These are:...
Separating Frontend and Backend versions (pleroma.social)
Separating Frontend and Backend versions (pleroma.social)
Pleroma Blog - We got a grant from NLNet! (pleroma.social)
Nice to see the Pleroma team getting an NLNet grant so development can pick back up. I missed it when it happened but apparently there was a big shakeup with the Pleroma dev team. I'm glad they seem to be recovering from that and hopefully we'll see some sustained progress with Pleroma again.