Reactive centrifugal force is not the same thing as centrifugal force. Reactive centrifugal force is the reaction force. It is the reaction force reacting to a centripetal force.

Centrifugal force appears to increase with speed of rotation.

Centrifugal force is a myth. It doesn't exist.

Centrifugal force is a measure of the opposite reaction of a centripetal force.

The centrifugal force is an apparent (ficticious) force, caused by a rotational movement. The amount of the apparent centrifugal force can be calculated by the same formula as the amount of the real centripetal force.

Centrifugal force is used in a roller coaster.