Of course there is no official way to hold slaves in Austria. However stories of foreign diplomats that hold "household staff" under slave like condition surface with saddening regularity.

Very often they are stripped of their passports in a country where they don't speak the language, so their perceived options are very limited.

Being a UN seat with a lot of diplomats certainly aggravates this problem, as do the restrictive immigration laws, that do little to protect people that want to escape from such circumstances.

Also in the case of the actress, her perceived options might have been very limited, while in practice the "only" thing she would have to fear after defecting would be assassins sent after her. Scary enough.

So I also think the question shows a limited view of the world, but is not offensive enough to accuse someone of being brain damaged.