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.
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.
Interestingly the 26 refers to the USA. But a similar career would be legally possible inside the USA (not under the program) but not in EU, due to heavy labour regulations.