a) The Affiliate Program is subject to these Terms and Conditions and any additional terms provided by the BitSkins.
b) BitSkins reserves the right to modify or terminate the Affiliate Program at any time, with or without notice.
c) BitSkins reserves the right to investigate and disqualify any participant engaging in fraudulent or abusive behavior.
d) Any rewards earned through the Affiliate Program may be subject to taxes or other applicable fees as required by law and all related obligations and legal consequences are solely the responsibility of the User.
It is not surprising that at this point, the company want to lay off the benefit that is being sent to their affiliate marketers. I do not see any other thing that happened but they systematically migrated in order to achieve this. They must have benefited from the number of referrals you have given them over the years and they feel that they have paid enough for your efforts and decide to start a new system. I don't think you have anything much to do. It is either you forget about the company and move on or you start a new referral business in the new site, in few years time they'll also do same.