MawBe
Actually I know very well what they do -as nieces, a nephew , daughters and sons of various friends and back in the day two of my cousins did it.
They also managed to fit in a fair bit of skiing and social life, so please don’t preach.
So you must be aware that it is quite a bit harder than being an Au Pair (Au Pair conditions are very strict and very clear- 30 hours max, and no sole charge of children for more than a few hours, no heavy housework, time for leisure and language school all paid for, etc)- so why call them 'entitled' and Gap Year Ya, à la Hurray Henry. I only commented because of the tone of your comment, so no preaching from me.
I am surprised you have never watched 'Chalet Girl'. The girl is actually not posh at all- and from a very modest home in the UK, trying to live her dream. With silly Bill Nawie (can't remember how to spell it).
And yes, chalet staff, and Au Pair girls- do have time to ski, snowboard, and more- in their free time- just like Au Pair girls.
Many youngsters who work in ski resorts, Hotels, ski shops, ski schools, and equivalent in Summer for sailing, surfing, etc ... do have very full time jobs, working very long hours. And as said, many stay and their jobs evolve with time. Many settle and stay- and take on very full time and responsible jobs and have families.