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Re:Is XMPP any good? Also, let's write a client in Tcl, maybe by wusspuss on Saturday April 23, 2022 @05:53PM (#31138980)
How much worse than XMPP is Matrix in this regard? On XMPP your and your interlocutor's server can see who you talk to
Re:Is XMPP any good? Also, let's write a client in Tcl, maybe by zaik on Saturday April 23, 2022 @06:23PM (#31139219)
Not a lot better, but in public MUCs your JID is hidden to everyone except the server the MUC is hosted on. Also MUCs can be configured to only send a limited amount of history to new participants.

For this reason I'm somewhat uncomfortable joining Matrix rooms over bridges, since it leaks my XMPP address and participation to everyone forever.