Just checked the definitions article in the Vehicle and Traffic laws. They aren’t defined as Bicycles, In-line skates, Roller skates, Skate boards, or Vehicles so I don’t know what laws would apply to them.
What exactly is a Kick scooter? Does it have an engine or is it just propelled by your foot? I have only seen them on the sidewalk but it doesn’t mean they are legal as I have seen motorized bike on the sidewalk and I know they are illegal. As long as you are not bumping into people I don’t think the cops will bother you. In the street I think it’s too dangerous.