What's so funny?
I use a chainsaw to do the hedges all the time. I have two hedge trimmers, a 16" and a 20" but they will not cut a stem thicker than 1/4". A 20" box store saw will cut whatever. Chainsaws are bad about jamming up with stems packed under the clutch cover. I use the hedge trimmers on the Taxus shrubs but on the fast growing stuff like privet, it's Chainsaw time.
I dread the thought of swinging a chainsaw on a rope though. That is almost like playing Russian roulette?
Notice how the saw on the rope, if it was angled correctly to cut, the saw swinging would diminish, and the saw would settle into the hedge causing a gouge? Terrible job.