I don't think there is any magic or paranormal involved, but I do think bigfoot can generally see cameras and can hear them.
1) I have a couple friends whose hearing is a bit better than mine who can hear a whine as the capacitors charge up to power the flash. Short range, but they do hear it.
2) I did an experiment with my trail cameras. I set two up facing each other in the dark, then tripped them so I could see what they look like under infared light. The are black cubes, no sign of camo at all. Makes sense since I.R. pictures are of differences in heat, not in differences of color. And if BF sees into the I.R. range, waves a bit longer than we see, which I already have first hand experiential evidence of, then likely they see the cameras as weird black rectangles on tree trunks too.
3) Another thing people foolishly ignore is deployment. Generally we set up game cameras looking at open spaces waiting for deer to walk in front of them. We don't usually set up cameras in heavy brush because the moving brush triggers pictures, sometimes thousands, when there's no critter involved. The bigfoots, at least those near me, stayed concealed even in dark which means they were not standing / lurking in the kind of places hunters would set up cameras. I do not expect much in the way of incidental bigfoot pictures on cameras set up for deer. If you want pictures of bigfoot on a camera you have to set it up FOR BIGFOOT. That means those millions of hunters' cameras ... are a red herring argument. The only ones that count are the ones 'footers put out, understanding 'foot habits (which we really don't, we only hope we do), in places there are actually bigfoots.
In other words, of the fifty eleven bazillion trail cams out there, only about 3 are in useful places. The rest .. so far as bigfoot, are a waste of batteries.
IMHO.
MIB