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Signal – an ethical replacement for WhatsApp
(greenstarsproject.org)
This is a most excellent place for technology news and articles.
I think it's by request. the fdroid team build every single app in their repos which means that they are not always fully up to date, so signal argues that whenever they need to push a security release people on froid would take forever to update.
I think I've had this issue with simplex. I've had to wait over 2 weeks for an update. That's why I'm using obtanium for it instead