A few people I socialised with at university had live-in housekeepers, and I wouldn't be surprised if one or two of them had a rough time.
Most of the students from Asia or the Middle East, whose parents were paying tens of thousands of pounds for their child to attend a British university, had staff at their parents' home.
One close friend was a British girl who'd grown up in Hong Kong, with a full-time au pair. She complained that the other HK and Chinese girls she shared a kitchen with didn't know anything about cooking or cleaning, since their au pairs had always done everything for them. In her case, her parents told her to "help" the au pair with chores, in the same way I helped my mum, so she'd learn. Presumably, her parents knew the arrangement in Hong Kong wouldn't last forever.
I've also met a couple of people working as au pair's here, both ~20 year old women mixing the work with studying, which is the usual sytem in Europe. It looks like a very poor deal, for example [1] £320/mth for what's not far off full time hours (37.5hr/wk would be full time in a government job).
[1] https://www.aupair.com/en/job/lisburn-united-kingdom-765795....