Oddbean new post about login | logout SimpleX is pretty good. But why not Matrix?
Did you even bother looking ((( WHO ))) was behind ((( MATRIX ))) lukesmith.xyz/articles/matrix-vs-xmpp/ Hint EVERY SINGLE TIME
It is true that Matrix massively leaks metadata. But so does xmpp. For secured decentralised protection of that there is simplex. Xmpp is vulnerable to the mitmls attack som government used against a russian server and that attack vulnerability has now been mandated in EU(SSR) law.