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Poland directs officials to ditch Signal in favor of 'secure' state-developed alternative
(www.theregister.com)
This is a most excellent place for technology news and articles.
The main problem is control ig. On Signal, someone can ask for a code or passwords to log into your account or get your data. If you have your own solution, you can have physical security keys to verify yourself, making it impossible to give anything to anyone via the internet. You can also monitor logins and make logins on new, unauthorized devices impossible.
Encrypting stuff is not really the hard part of keeping oblivious users safe. As far as that goes, they will be fine if they have people who know what they are doing use established, well audited implementations.