Samantha acknowledged CW had realised the challenge wasn’t registering wins of 250,000 coins but it was registering wagers of 250,000 coins but she also said that they had decided not to change it in her announcement post Issue With "Win 250,000 Coins in one spin on any Slot Machine, 25 Times" Challenge
It feels a little unfair to me if players don’t have the means to make that size of wager 25 times and risk not winning, she suggested swapping it out