Although some have said that the use of the jump scare ad has made them want to see the movie less, I still think that the message coming out of this is that The Nun had a 6-second ad that was so scary it had to be pulled.
For the curious and horror fans who got a kick out of it, that message certainly sets up The Nun as a horror movie you have to see to find out just how scary it actually is.
While that might seem like a negative for The Nun, I kind of think that this unintended consequence will prove a great bit of press for the film.
You can definitely understand how an ad like this might not be appropriate to run in front of certain videos so it is makes sense that YouTube covered itself by removing it as an ad entirely.