Having recently cruised with Princess late last year and Celebrity in mid January, it was noticeably different on the mask protocols from different cruise lines, I liked how Princess enforced or at least tried to get passengers to wear masks.
There hand washing stations and sanitising reminders was commendable. On the other hand Celebrity only offered sanitiser upon entry into the buffet. Never mentioned in theatres or public indoor areas to wear a mask, it was quite noticeable to us having been on Princess not long before. We both tested positive for covid on Celebrity towards the end of the cruise, fortunately we had a balcony.
The Celebrity captain made a public announcement that all crew did not have to wear a mask from January 6, it was up to each individual,