IMHO: Lessons learned from WhatsApp

Building an open alternative to the propriety WhatsApp messenger would be a desirable option. And indeed there are lots of open (e.g. beem, yaxim,…) as well as non-free competitors but none of those could supersede it, although there were some reports about security problems and account hijacking. So what might be a key feature to bring the open alternatives to a broader audience?
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