People go to the ME3 or elsewhere for a variety of reasons. Once you get there and it's not what you bargained for, no one stops you from leaving. You pay the remainder of your bond and off you go. You knew this when you signed up.
It's not the life for everyone and everyone's situation is different. It's always interesting to hear someone ***** about how terrrible it is/was after they leave having spent a decade there or else from someone who has never been there but just heard from someone.