Ouija Boards are really very old conjuring tools. They were once called plancette or planquette, I forget. Used very effectively in the novel The Haunting of Hill House. I have a Ouiji board that glows in the dark! It’s something that seems to work better with children than adults - and that’s another thing that makes them creepy.
Satan is very old and uses his tools to lure, tempt and bring into his "fold" as many silly, sad and unprotected souls as he can.
I suppose that the boards can be fun if they make people laugh.