You can remove profiles from your followers list on Threads.
When you remove a follower, they aren't notified that you've removed them.
If you’ve
turned on sharing to the fediverse, users, from their servers, can search for and follow your profile, view your posts, interact with your content, and share your content to anyone on or off their server. Keep in mind that while users on other servers will be able to search for and follow your profile, you won’t be able to see who follows you from other servers. Your followers list in Threads will only show users that follow you on Threads, and your follower count – on both Threads and other servers – will only include users that follow you on Threads.