You probably shouldn't watch this if spiders creep you out, or you are legitimately afraid of them, i.e. phobia...
That being said, what would you do if you looked out your window and you witnessed spiders as big as your fist blocking the view of the actual sky. Do you suppose they have a spider leader, a spider god?
To be honest, it's pretty cool, they're likely trying to imitate what they normally do in the jungle, it's just that you can see them all without a jungle canopy blocking the view. That being said, I don't want to see it for real...