This always bugged me about my previous workplace.
I worked at a home for children with severe learning difficulties. We provided 24/7 care, with dedicated night staff to stay awake all night just in case any of the young people needed assistance (and do laundry, cleaning, etc). The shift patterns were that we worked eight hour shifts, either an early or a late, with a bit of crossover for handover in the middle.
The management had pledged that all the young people would get at least one holiday per year, going away (usually in the UK) to a Centre Parcs, or somewhere with a lodge (Longleat, for example). However, the management would never actually pay the staff who took the young people enough for the job. Any staff going on the holiday would be expected to provide full care for the young people from the moment they woke until the moment they fell asleep, and also be expected to wake in the night to help if necessary. This amounted to at least a 14-hour day, and often a broken sleep (I.e. a waking night shift).
The management could only offer ten hours pay a day, and a “sleep-in” rate (I.e. you were only “on-call” at night and not actually expected to be needed – definitely not a waking night shift!) for ONE of the nights you were away for. The management always said “But if you don’t go, the kids won’t get their holiday, and they will miss out!”
Obviously, working in care, they were never short of volunteers who wanted the kids to have fun and have their best life. I never volunteered, because I always believed it was totally unfair to expect us to back up the management’s pledge with unpaid work. I tried to convince others to join my little rebellion, but most people did it for the kids.
I was bothered by this when I worked there, and remain bothered to this day.