Interesting! I think they have made a false statement to close your account. Winz.io team had told me different reasons on different times when they had withheld my withdrawal for KYC verification. I won't be surprised if they tell you a different reason in the future for blocking your account. BTW, were you playing table games or slot game? Opposite betting is possible in table games, but there is no way to make profit through such betting pattern in table games (E.g. Roulette, Baccarat, etc).