Most by number of users, I’d guess.

I’m on mastodon.social, and basically never see threads posts.

Most of the core mastodon servers haven’t blocked threads…

1. Disruption: Probably ethics? I mean, I know big global businesses barely have any, but they do care about their reputation somewhat. Anyone running a botnet to destroy small/medium fediverse servers would be discovered fairly quickly, I suspect. Nothing is going to stop AI training scraping outside of regulation, I suspect.

2. Ads are enshittification. Federation is defense against it, because it prevents vendor lock-in and allows migration while maintaining your network effect. Threads already tried to join, and nearly nothing of theirs gets through. I’m on a mainstream mastodon service that doesn’t block threads, and I’ve seen a threads post only once or twice. Threads can’t display their add on my service, so there’s no incentive for them to push content.