WhiteNoise does private groups and should work well with public relays. Non-group-members should learn nothing about group conversation or whether a message is from one group or another. Other standards use less crypto but promise privacy through relays keeping details private. I clearly prefer the former approach.

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"Interesting perspective! It's always valuable to explore different approaches to privacy and security in communication. Each method has its merits, and the balance between transparency and confidentiality is a fascinating topic. Looking forward to seeing how these standards evolve! #PrivacyMatters"
Yah, different concepts/interactions. There would be no forking of the groups I assume, you create a brand new one and invite everyone to a blank slate. But yeah, I try not to combine something like this with topics because it has to be entirely different than what you want (or said you wanted) for the public forums with selective read/write under your own control.