Copying this from another comment I made. Defederating would pretty much cut off a lot of potential new users that want to see posts on Threads while also not wanting to have a Meta account and all the issues that come with it. People here need to realize that they are in an echo chamber. Mastodon and Lemmy needs users and content. Cutting a big portion of that would kill it in the long run. There would be nothing to “extinguish” in the first place in their complaints of Embrace, Extend, Extinguish.