From a protocol/network perspective Signal is very secure, but that only matters if the device of every person in the group chat is uncompromised. The security

From a protocol/network perspective Signal is very secure, but that only matters if the device of every person in the group chat is uncompromised. The security of the app is meaningless if the security of the OS/runtime/firmware it is running on is broken... and don't forget to multiply that risk by the number of people in the group chat. Also based on what happened here it is self-evident that Signal can't be trusted for this use case because its too easy to include non-authorized third parties. Like you can't even argue this point because what happened happened.