That’s quiet an old review. The most obvious concern: Verifying a contact has been implemented. As you can see in the Messenger-Matrix by the same Author.
I still genuinely don’t know how to do this. Contact verification works within a 1-1 chat, but it’s unclear whether it’s the same contact in a group chat.
For example:
Open a group chat that you have a friend in
Tap their avatar, bringing up their contact info
Tap “Verify Security Code” and take note of the value
Tap Back, then tap "Send direct message"
In your DM screen, tap their avatar at the top, bringing up their contact info
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