Federating with Threads only hurts Meta. It does not help them in any way.
This is completely false. The entire reason they’re federating is to instantly get access to a much larger pool of UGC for their users to interact with. And of course they get to also choose who to federate with and who to block, so they can choose instances that have the kind of content they want, all for free, while suppressing instances they don’t like. If your instance starts to try to “convert” people off of Threads, they can (and will) just block you.
Users who create accounts on Threads because they actually want to communicate with people they’ve heard of helps Meta. Defederating helps Meta.
Threads has more users than ALL fedi.db-tracked fediverse instances combined (Threads: 160m, Fediverse: 10m). They don’t need us for users, they need us for content. Just like Reddit, there are usually a few dedicated ‘content generator’ users on any given instance, who post the bulk of the UGC. Gaining access to those is Threads’ goal. Federating is how they achieve that.