I think possibly the larger frustration that is really peeving some individuals (myself included) is the poor communication of the changes. When you book a vacation, you determine the value based on the offering, and pay what you think it's worth, or move on.
Many of us booked multi-thousand dollar vacations with the understanding we would be eating 2 lobster tails, enjoying scrambled eggs in the morning in our rooms, and have the presented number of dining options at the posted times, without paying extra.
A small asterisk on the website a few months in advance mentioning "*fee applies beginning January 1, 2023" would have gone a long way towards making the brand look more trustworthy and feel as if it was a decision made in confidence, instead of a hacky cash-grab. Celebrity had a chance to control the narrative on price hikes and spin it anyway they wanted, but they fumbled.
The mediocre comms, coupled with investor calls explaining record bookings, cost stability, and an appetite to squeeze more money out of passengers at a time when everything under the sun is going up in price feels like an opportunistic move that isn't really appreciated by many at the moment.