It's neither of those options. It's not cheating, but it is just dumb. Tape and sharpies are cheaper and as effective as the LED (depending on the color of the marker). Sure it may take a couple seconds longer to apply the tape than just sticking a suction cup on the screen. Sure the tape also has a limited life span, but you can substitute that with some kind of static cling film. If they want to go out and buy the LED thing, I'm not going to stop them.