It’s a cool feature and one we like to talk about. The pigs seem to perceive the net like they would vegetation. They aren’t leery of it and don’t seem to realize they’ve been trapped until you show up (or they sit for a longer time in daylight). If they see other pigs in the trap feeding, they keep pushing in (see video).
It’s great to watch on camera if you feel like it, but you don’t need to be up at night watching and waiting.