If you want to let Princess leadership know you are dissatisfied, contact them and let them know. There are a number of actions you can take. There is the post cruise survey, writing letters, choosing to sail with a line that doesn’t have the same pricing structure, messages on social media. Basically sending a message to those who set policies and pricing.
Removing crew appreciation charges onboard is not an effective way of saying don’t like the system. It might mean you don’t think you received good service, think the crew already makes plenty of money, or many other things.