Let me say sorry first, my answers are going to be very disappointing for you.
Sorry.
My works so far are not very lore focus, they are vibes at most.
They are meant to feel dream like, in the sense that you are watching something you don’t understand and couldn’t change.
There is little or no explanation for lore.
That means the real answer to all your questions is just: Up to interpretation.
I’ll try to answer your question in order.
#1) I never thought about it.
It could work as one universe, where some one is watching bunch of messed up videos and wondering if the videos are real or not. Maybe that person used to know some of these people in the video but lost contact long ago.
But, I never thought about this until you asked.
#2) I personally think the society’s view would be same as the real world. These videos are meant be seen as something strange to the viewer. That said, I don’t feel very strongly about it. Honestly I don’t mind people coming up with their own explanation. I have fun reading other people’s interpretations.
#3) They don’t seems to care, or maybe they are just not thinking about it at all. Those people’s direct thoughts are not accessible on purpose.
As I wrote earlier, not understanding is part of the vibe I am going for. That is to say, I don’t have a real answer.
#4) It is an open palm salute.
#5) They probably do. As for why they don’t react, the answer is same as #3.
#6) Impossible to know. It is simply a possibility.
#7) She is putting up a show. As for why, same answer as #3. You are not given any explanation on purpose.
#8) Some of them might.
#9) Blood lost or suffocation.
Thank you for reaching out. I’m sorry that I have no good answers for you.