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WhatsApp provides no cryptographic management for group messages
(arstechnica.com)
This is a most excellent place for technology news and articles.
If you want your group memberships to be known only by the group members, use Signal.
Just be sure to add only the people you want to be there. I've heard some people add others and it's a bit messy
How bad can it be, it's not like we're sharing state secrets
We're clean on OpSec