@noiob More typically seen with a saw sticking out of it: https://www.mariowiki.com/Chainsaw
@noiob I'm unfamiliar with its full properties in Mario Maker, but as I recall in Super Mario World, the purple thing indicated a machine that moved back and forth along the visible track, with different things attached to it. Blades as obstacles, a rope to jump on and ride, etc.
I can only guess the more traditional cloud moving platforms tend to vary in speed, so maybe they wanted the single speed of this.
okay so apparently that's just a normal moving platform