I would strongly disagree regarding the shared core goals.
#ActivitPub undergirds Gab, TruthSocial, Threads, and those are just a small number of the forks/feature-comparable Mastodon-like platforms. They share almost none of the goals, but are opportunistic and support reusing infrastructure others build & maintain for their own purposes, w/o contributing upstream.
@amgine Agreed, and I wouldn't count those as part of the fediverse, just parallel social networks that happen to use some of the same architecture or standards.