"Lemmy" is just software, it is not an entity that can federate/defederate as a whole. Instances can federate or defederate. I think most instances have defederated, with the notable exception of the largest instance, lemmy.world (which, again, is not "lemmy").

[–] LifeInMultipleChoice@lemmy.world 3 points 7 months ago (1 children)

I have a Lemmy world account I log into frequently, I have never seen a threads post here. How would they appear? Or would I only see them on Mastadon

[–] SorteKanin@feddit.dk 4 points 7 months ago* (last edited 7 months ago) (1 children)

You would see them as posts or comments, just as you usually see posts and comments. Users on Mastodon or Threads can reply to posts or comments and it will show as comments on a Lemmy instance. They can post with certain hashtags to post to communities.

I'm not 100% sure if Threads has started federating yet, so that could be why you're not seeing anything.

[–] LifeInMultipleChoice@lemmy.world 2 points 7 months ago

Yeah, it likely hasn't started, as the influx of posts/comments would skyrocket