I'm sure many of you have seen the Threads list of servers they have defederated from.
https://www.threads.net/moderated_servers
I think it's really interesting that "No publicly accessible feed" is a criterion for defederation. It's definitely a cover-your-ass type move: if they can't scan your public feed then they can't really know who you are so they might as well preemptively defederate.
This, and other behavior from Threads, leads me to believe that they are about as scared of the fedi as we are of them.