While I use Signal and am a proponent of secure messaging in general, it would be valuable to discuss the threat models for different messengers and privacy tec

While I use Signal and am a proponent of secure messaging in general, it would be valuable to discuss the threat models for different messengers and privacy techs. Threema looks smart, and I what I think is missing from the material is what threats it addresses and how. Does it: - protect the content of your messages from mass interception? (appears to, barring crypto errors) - protect the anonymity of you and your correspondents from network operators and their staff and admins? - protect your contacts and messages from reading and exfiltration by other apps on your phone? - protect content of your messages from corporate mobile device management tools? - protect anonymity of correspondents and contents of messages from targeted malware that has rooted or jailbroken the device? (probably not, but wickr's aliases can mitigate it somewhat) - protect anonymity of you and your correspondents from captive portals? (+ message secrecy/integrity) - protect message content and correspondent anonymity from theives/attackers/co-workers with phone imaging forensic tools? - protect group membership from infiltration using unauthorized, stolen, or cloned app memory images? This isn't a complete threat model (I generate these for a living), but having short answers to these would go a long way to making a case for a secure messaging product.