Meta announced that users on Threads will be able to see fediverse replies on other posts besides their own. In addition, posts that originated through the Threads API, like those created via third-party apps and scheduling services, will now be syndicated to the fediverse.
I’m rather guessing the other way around. Because they can’t directly extract money from this, they can’t justify to their shareholders to sit down full-time devs. Instead, this is a project solely run by interns and student.