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An analysis of X(Twitter)'s new XChat features shows that X can probably decrypt users' messages, as it holds users' private keys on its servers
(blog.cryptographyengineering.com)
This is a most excellent place for technology news and articles.
If a corporate entity made it and hosts it, and it isn't foss, don't chat on it.
There is another layer here. If you or the person you're talking to are using an entirely unmodified android or apple phone, you don't have any privacy even if you're on TOR connected to an encrypted xmpp chat. Your entire existence is backdoored. The entire OS speaks back to its maker, especially that keyboard.