Afaik, whenever an Activitypub instance has defederated from another it has always had to do with some combination of bad user behavior, poor moderation, and/or spam. Are the various instance admins who have decided to preemptively block threads.net simply convinced that these traits will be inevitable with it? Is it more of a symbolic move, because we all hate Meta? Or is the idea to just maintain a barrier (albeit a porous one) between us and the part of the Internet inhabited by our chuddy relatives?
Pretty much this, and I’d like to emphasize the part where Threads userbase outnumber the Fediverse 30 to 1 after only one day.
Lemmy is evolving into a very nice place so far because of the type of users it’s attracted, and the fear is that the atmosphere would shift on a dime when the voices here get drowned out by hundreds of millions of commenters from Instagram and Facebook.
A few years ago, Reddit strategically banned two terrible subreddits during one of their shitstorms (the whole AMA firing scandal), just as Voat was getting popular. It turned from a decent community that was starting to grow and challenge Reddit’s presence, to a right-wing extremist cesspool overnight.
You also see this sort of thing happen to subreddits all the time. Some of them go from a good community, and either slowly or quickly, shifts into a much more terrible version of itself. Russian bots/ops have transformed subs to push their own agenda.
The community matters, and how that community evolves matters a great deal. Communities can live or die from massive migrations like this.
I started a community to track the H5N1 global outbreak but I do NOT want to moderate it long term; if it picks up, the anti-vax/Plandemic people are going to start showing up (they already do sometimes in the subreddit for it). I feel like opening the doors to Threads is going to hasten that.