If the author was honestly trying to communicate, he would believe that the reader is already expecting it to be X, but it tends to get used for things where you didn't even consider it to be X in the first place. So it's not clarifying a potential misunderstanding, just making it sound surprising even if it isn't. You're left with the feeling that something's importantly different from expectations even when it's not.

In this case, I think it's fine. It points out that the victim only has to trust YouTube itself, not a stranger posting on it (eg, if it was listed as an example of a user comment). But I'm desensitized to everybody else abusing that construct so it didn't communicate that to me.