MITM
Not sure how a virtual paperclip can be added quietly on end to end encrypted comms. If they were able to do a man in the middle intercept of traffic between 2 people then it could be used to MITM attack other things (web traffic, payment traffic etc). Most algorithms and approaches stop MITM, so they'd need to hack the source or target instead (or terminate the encrypted traffic at a proxy) but the receiver would then see it in the clear and not encryoted..