I dont think that any of us can claim that they are retroactively changing the terms.
They have agreed to keep old players under the old terms that were initially agreed upon. All of your old players are still mapped to your account, and you are getting paid for them using the agreed upon method.
Going forward you have the choice to continue to do business under these new terms, or you have the choice to try a different program. What you decide to do is of course your decision but I dont think that we can accuse casinorewards of doing anything wrong. Whatever you decide to do, it wont affect your old players.