In my long career of first hitchhiking the world and then bicycle-touring/bikepacking it, I have spent hundreds of nights outside stealth camping, but I have been caught more often than you suggest happens. Farmers in some places do daily rides around their land to check for squatters or illegal tree-felling. Male friends so often like to walk into the woods and drink (and fire off weapons, which can be unnerving to one sleeping). And I’ve been told by forest rangers that they are increasingly using drones to surveil forests instead of having to go down every trail themselves.