Based on the history of how Google Chat used XMPP to federate and basically siphon users into its closed UI, then defederate… I no longer trust anyone with a closed UI that’s planning to offer “extra value” to its users.

If someone closed their open UI, you can always fork the last open version, which at least gives you an even start.

If Twitter 𝕏 were to switch to ActivityPub… I’d actually worry about people flocking back to 𝕏, back to their old networks and recommendation algorithms. Guess it’s no longer possible, since 𝕏 pretty much destroyed the old Twitter environment, but I’d still worry… and with Elon wanting to make 𝕏 a “social network for everything”, that sounds dangerously close to ActivityPub.