The Earth's rotational centrifugal force does have an effect on objects on its surface, but it is not strong enough to fling us into space at the equator or any other location on Earth.
The centrifugal force is an apparent force that arises due to the rotation of a reference frame. It is directed outward from the axis of rotation and is proportional to the distance from the axis. At the equator, where the distance from the axis is the greatest, the centrifugal force is also the greatest.
However, there are other forces at play that counteract the centrifugal force and keep us on the Earth's surface. The primary force that keeps us grounded is gravity. Gravity is the force of attraction between objects with mass, and it pulls everything towards the center of the Earth. Gravity is much stronger than the centrifugal force, which is why we don't get flung into space.
At the equator, the centrifugal force and gravity are in balance. The Earth's shape, with its slightly bulging equator and flattened poles, is a result of this balance between gravity and centrifugal force. This shape, known as an oblate spheroid, reflects the equilibrium between the inward pull of gravity and the outward push of the centrifugal force.
In summary, while the centrifugal force due to the Earth's rotation is present at the equator, it is counteracted by the stronger force of gravity, keeping us firmly on the surface of the Earth.