I think spin might have an effect but I could be wrong.
Imagine the court deforming downwards very slightly when the ball lands. This crater-like shape is no longer horizontal and the ball's spin would grab onto the side of the crater which is inclined upwards and accelerate it upwards.
I could be wrong but it seems to me that even average net clearance balls can be made to explode off the court.
Wilson [K]Six-One LITE
Wilson nSix-One Tour