Changing rules in the middle of the competition is bad... really bad. I wonder if there are other players who have been scammed. I guess "scammed" is a nice choice of words.
Frankly speaking, I can say that I am a victim of this change because I tried to participate in the $11k wager race before they changed the rules. I am pretty sure that Plinko was not on the list of restricted game for the race but after I wagered some (lost some as well) fully on plinko game, I realized that my username is not on the leaderboard although I think with what I have wagered, I should be at least on top 25. After checking the terms back, I was surprised that Plinko is added on the ineligible games for the race. At that time I wanted to post a complaint in this thread but I had no proof, good thing is that xGennady took a screenshot.