https://help.instagram.com/914046486923176/

>When Threads blocks communication with other servers on the fediverse
>...fails to meet our Community Guidelines...
>We’ll also block a server if it doesn’t have a:
>Sufficient privacy policy; or
>Publicly available policy to restrict access to users under the age of 13; or
>Publicly accessible feed

There are two fediverses. One of them will comply with these rules, and with whatever rules come after that.