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.
It is easy to guess what can happen by looking into the past history. However, we may see another decision from Duelbits team if the user still manages to stay in profit by participating in the tournaments. They will change the rules and remove the restrictions from old participants.
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?
They can afford to pay the tournament prizes. The main problem is that some users had managed to maintain profit by participating in the tournaments in the long run. Duelbits team wants to verify now whether there is really any problem with the tournament rules or not.