Only one hope here, it is not seeing other complaints from users who get banned or excluded from their promotions because the users make profit regularly from the tournaments.
Most probably, we will see similar steps from them if the new users also manage to maintain profit through the tournament prizes. Duelbits team hasn't changed the rules of the tournaments yet. I believe they will bring changes in the tournament rules if similar thing happens again. Let's wait and see.
You seem to be sure of what is going to happen, and I can't blame you for that, some antecedents and patterns will always be key factors for certain predictions.
However, it's better to change their Ts&Cs if it's causing much trouble in paying big winnings. If the Ts&Cs are stringent enough and they can reduce the winnings to afford them to pay, why not?