Simplify Polygon not working

simplify.geojson

{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          -75.693254,
          45.431144
        ],
        [
          -75.693335,
          45.431109
        ],
        [
          -75.693335,
          45.431109
        ],
        [
          -75.693254,
          45.431144
        ]
      ]
    ]
  }
}