Legally, they're supposed to have one day a week off, but in practice this is not enforced and the maid has no leverage: many have paid large sums to brokers and need to work several years just to repay their debts.
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.
I have no issue with people hiring housekeepers but the work conditions absolutely need to be decent. And if for some reason they feel that there's too much risk in being decent, then they shouldn't hire a live in housekeeper, they could also easily hire locals to help with some housework.
Of course, that's not everyone, I have some Malaysian friends who treated their live in housekeeper with respect, let her take some holidays and even helped her set up her own business when she went back to Indonesia. But, that's the exception rather than the norm.