The term is for when a manipulator keeps saying "we" this, "we" that, when really they should be saying "I". It's a form of manipulation I believe is called "forced" something.
Youtubers do it a lot.
The term is not "royal we" or "majestic plural".
I cannot remember what this term was called.
EDIT: What I'm referring to is something like the use of plural first-person pronouns as a tactic for fostering parasocial relationships through "verbal immediacy".
Here is an article discussing the utility of this specific tactic itself.
Here is a study measuring pronoun use (among other things) in Celebrity tweets.
Sorry for the offhand style of the original question.