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By Default, Signal Doesn't Recall
(signal.org)
This is a most excellent place for technology news and articles.
That's true, but nothing does. Once someone receives a message, you have no control over what they do with it (regardless of communication channel, encryption, etc.). I read the comment above more like "instead of jumping through hoops to get around the spyware in your operating system, use an operating system that does not come with built-in spyware instead".