Regarding the macOS installer: did this turn out to be real? Last time I saw this turn up, there seemed to be some question: https://news.ycombinator.com/item?id=22750619
The only question is different interpretations of “fake”: it is a real system dialogue, invoked by a deprecated API; it is fake in that the text is set by Zoom to trick the user into allowing it to install itself without approval.