No Crazy Plinko Game is not legit. In Crazy Plinko Game when you may think that you going to be paid, the developers of game cut you off. That is the system they have in place.
The underlying algorithm for the Plinko simulator is based on a two-dimensional array with the width and height of the board being simulated. The values in the array correspond with the slots between a row of pegs, an empty position is represented by a zero, and the current position of the chip is represented by a one.