Same thing with au pairs and childcare work: https://www.npr.org/2019/01/09/683831264/au-pair-sponsor-age.... It’s basically below minimum wage.

Exactly. Au pairs are super common in Europe too, I even know of American ones.

The appeal for foreigners is living temporarily in Germany, Switzerland, etc.

It's an exchange: the host offers a roof, pays next to nothing for a live-in nanny, etc.

It's tourism + work.

I don't think anyone would do this as a career, and locals just do it in another country.