I can tell you from first-hand experience, bent-over or freshly broken trees, or extreme " leaners " are rubbed regularly in the mountains around our camp. Not man-made or placed, but naturally occurring trees that bucks just seem to like using. There's one very near my # 1 stand for rifle season that's been used for about 10 years now. It's a maple tree that got bent over from another tree falling on it and now it grows horizontally. Trunk and limbs all get rubbed.
Edit: This tree does have new growth going vertically upward, but the main trunk is still horizontal. Rub scars on it look like one big skidmark.