I will say that games like Dice and Plinko are games that are purely based on luck but there may be some players who think they found a strategy to beat the house. Giving them benefit of the doubt, I don't think they would ever reveal that in public for free. They do not want the casinos to find out either and for obvious reasons.
Both are purely based on luck, but between the two I like my chances on the dice game I seldom play Plinko I have a long run of bad luck here, can't find a good strategy that will work even in a short term, compared to dice there is a martingale, that you can use to take your chances Plinko is an all-out luck-based game, but I would not defend that martingale works, there are still risks using it, but you can take a chance if it's your lucky day.