@oli In a world where Threads was fully integrated with the Fediverse:

Step 1. You get a follower from Threads

Step 2. You make a post that gets their attention

Step 3. The Threads user boosts it to their audience

Step 4. Your entire server is now dead because your server cannot handle a measly 100,000 likes from Threads accounts it has never seen before. It has to fetch all their profiles just to process the Like/Favorite. Your server is now stuck in Sideqik Hell (or equivalent) and grinds to a halt. Just because of ONE post you made.