I keep seeing this article posted to scare people, but Lemmy and Mastodon aren’t in the same situation as XMPP. XMPP had barely any users outside of Google Talks, with the overwhelming majority of interactions on XMPP being between Google Talks users. Google was tying their product to a public standard that they couldn’t develop however they wanted, all for compatibility with very few users. When they pulled out of using XMPP to develop their own platform, the sheer lack of users on XMPP outside of Google Talks became apparent. This will not be the case with Lemmy/Kbin/Mastodon/ect. Mastodon has 10 million registered users, and Lemmy has hundreds of thousands. The majority of both service’s users are not about to switch over to sell their soul to the Zucc, so if Facebook federates for a while before defederating, Lemmy and Mastodon will have as large and robust communities as they have now, and the services will live on unlike with XMPP
It’s basically an alternate version of Mastodon, similar to how Kbin and Lemmy both do similar things while being seperate projects, and a fork of another project called Misskey