That is weird. #Threads has banned #CounterSocial even though #CoSo is not in the #Fediverse.

I believe an AI is automatically banning sites as the flagship #Mastodon & #Misskey sites were previously banned (myself & others brought it to their attention & the sites were removed from the ban list).

All #Pixelfed sites (a federated version of #Instagram) are muted for not boasting a public feed.

You can look at Thread ban list here: https://www.threads.net/moderated_servers (you must be logged in to view it)