Please dont draw your own conclusion , my maid has eaten at home as she is Indonesian and does not eat pork . Moreover , she prefers to hang around the shopping centre instead of sitting inside the restaurant where she would have felt awkward if she's not eating together.
My wife is chinese and she has a good heart , we will not abuse maids like you think. Being Indian , we take alot of curry which she joins us but not pork .Hope you understand situation and not accuse us of being stingy and treating maids as lower beings.
If you have maids , you will not jump into such conclusions as this is a common practice.