No marketing program is sustainable without change and very naive to think otherwise. Carnival even puts in black and white. It is not Carnival's responsibility to notify members of changes, it is the responsibility of the member to keep up.
"CCL reserves the right to alter or modify the Club at any time in CCL’s sole discretion without notice to Members, including without limitation, the right to add, modify, delete or otherwise change any provision of the Terms and Conditions or any aspect of the Club, including without limitation, any procedure, the Levels, the number of VIFP Points required for any Level, the method of earning VIFP Points, and the Benefits, each as defined below. CCL further reserves the right to terminate the Club at any time without notice to Members. Since any changes will be posted on this page, Members should check this page regularly. Continued membership in the Club following any changes to these Terms and Conditions constitutes acceptance of such changes. "
Some think they have earned something when if fact they have earned nothing..
"Accumulated VIFP Points are not Member’s property and may be revoked, cancelled, limited or modified at any time. "