I think the implication was that people would voluntarily reduce how much they took. I don't recall seeing anyone suggest that doing that would be forced on anyone. If forcing it was suggested I must have missed it.
Yes I know that but if enough people consistently didn't take as much food, over a long enough period of time, the cruise line would realize that they could reduce the amount they purchase and prepare in the future. If the demand goes down, the supply can be reduced.
I wouldn't think that the people that receive cash tips would be allowed off in US ports because they are busy on turnaround day. Also, according to a previous post on this thread, banks don't perform such services for non-account holders.