You do realize algorithms won't apply to your instance, right? ActivityPub doesn't support the type of tech you're worried about.
I think many of the wait and see is due to not even knowing how well Threads will turn out. Threads may come out with some valuable creators. And if they implement the same capabilities as Mastodon, they can just limit Threads. People can see posts from those they specifically choose to follow on Threads, but nothing else.