Yes, I've seen families in Malaysia and Singapore that really treated their housekeeper badly. In a lot of cases, they are not allowed to go out of the apartment either because of potential pregnancy or because they are scared of the housekeeper stealing things from them.

They bring housekeepers from Indonesia and pay them very little. The housekeepers have to work a lot of hours and are pretty much treated as slaves. Often, the housekeepers are not allowed to eat at the same table, they have to eat after everyone has eaten, they don't sleep in a proper room but rather in a storage room.

At least, there's a contract and they do get money at the end but it's really a hard life and hardly more freedom than being a prisoner.

It always shocked me when I saw people that I thought were educated and friendly treat their housekeepers this way.