XMPP and Matrix are two competing federated end-to-end encrypted messengers.  XMPP is far better, on server cost decentralization, speed over Tor, degoogled push notifications, multi-identities, and overall privacy.  So if Matrix is inferior centralized bloatware, why is it more popular?  Especially among techies, who should in theory understand these concepts.

This brand new video gives a quick overview of the technical reasons that XMPP is the gold standard king of federation.  And it briefly discusses how Matrix manages to push it’s agenda:
https://video.simplifiedprivacy.com/xmpp-vs-matrix-why-matrix-sucks/