Here's another "summary of what happened" vis-a-vis XMPP: niche protocol is still niche after big player enters and, eventually, exists the space.
XMPP is doing fine, and ActivityPub will be doing fine after Meta. People crying end of the world for them are just using different - and wrong IMHO - metrics for what "dead" means.
https://ploum.net/2023-06-23-how-to-kill-decentralised-netwo...
And honestly, the article this submission is about, is pretty weak.
> I don’t worry about Meta embracing ActivityPub and then extinguishing the fediverse as we know it.
"I don't worry" is not a very convincing argument.