Court documents show FBI may have tool to access private Signal messages on locked iPhones
https://www.foxbusiness.com/technology/fbi-tool-access-priva...
https://www.foxbusiness.com/technology/fbi-tool-access-priva...
I translate that to 'an FBI informant involved in the criminal conspiracy saved screenshots of the messages'
The main concern is about intercepting messages between 2 parties or mass exploiting the history stored by the provider.
Sure, for some case, it can be important, but that's a much more difficult and rare threat model to address.