Discussing Embrace-Extend-and-Extinguish, @Gargron on @mike's podcast uses #XMPP as a historical analogy of how things can go wrong. He points out that XMPP had some self-inflicted problems, eg that the standard did not support new, desirable features quickly enough, like stickers in chat.
I hope we won't get the same problem in the #fediverse. #ActivityPub was created in 2018 and there is currently no W3C standards activity.
Maybe Mastodon could come back to W3C and help re-energize?