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 Another curiosity, @Vitor Pamplona. Is the info Signal servers receive not encrypted? They say they store no metadata in their server. Is not that true in reality. Why is then Signal so much celebrated in the infosec community?

I'll be very obliged if you take your precious time to enlighten us. 

Thank you. 
 Technically nothing prevents them from storing metadata on servers - only contents of messages are encrypted, same with Matrix. So, you have to trust Signal servers.
They also know your phone number 😅. 
Signal is so much celebrated because it has great UX, large userbase, battle-tested encryption (WhatsApp is based on the Signal protocol) and it was the first.