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Giving Up on Element & Matrix.org
(xn--gckvb8fzb.com)
This is a most excellent place for technology news and articles.
https://www.devever.net/~hl/xmpp-incident
This article discusses some mitigations.
You an also use a platform like simplex or the tor routing ones, but they aren't going to offer the features of XMPP. It's better to just not worry about it. This kind of attack is so difficult to defend against that it should be out of the threat model of the vast majority of users.