I know. The first thing I do after I see a new piece of kit is wonder "What other uses can this do" and this isn't even an outside use case. It's displaying a video feed. So, how do you determine what the video feed comes from? If it isn't hard wired, then someone is going to spoof the signal.
My wife accuses me of only seeing the problems in things. She thinks it is a flaw, I see it as a survival trait.