Important detail that is missing in the article and that some are getting wrong in the comments: This is not about forcing messengers to add backdoors for mass surveillance or weakening the messenger/its encryption in general (although that indeed is the wet dream of some governments/agencies). It’s about infecting the phone/device of a suspect (either by hacking remotely or with physical access, although in secret of course) and sniffing their communication before it’s encrypted/leaves the devices (or after decryption for incoming messages).