I have added threads to the blocklist. It does not show up on instance list, yet as I believe the server is simply unreachable due to disabled federation on Threads’ end.
As for the reason - I don’t feel comfortable providing data to Meta. At the moment Lemmy software is very trusting and every instance syncs quite a bit of data about users from other instances.
I imagine that it could also get pretty data-heavy if someone subscribed to a large server on threads (assuming it doesn’t become another metaverse).
That as well