Yeah, I would never mark my hunting spot on public land. I try to find spots near "fisherman's parking" so most folks don't even know I am hunting when I park. Never want to let others know I am in there. Either they will try to mess things up and/or steal my game cam if I leave one, or they will move in on my spot.
Too bad your nice spot might be wrecked. It has happened to me several times. Once on public land and once on my land when a neighbor built on my fenceline just 100 yds from what was becoming a yearly producer of nice bucks. Just have to move on.