These victims are usually promised very good jobs, better working condition with a very good pay. The offers are often very enticing and it is very difficult for anyone who is swimming in poverty to say NO to such offer. It is quite unfortunate that they don't get to meet what they bargained for and they end up doing jobs and working for people they ordinarily wouldn't want to do or work for.
and that is a choice they make, by continuing to lie to their victims and that happens because someone wants to change their life to be more decent, without thinking about what will happen in the future, indeed in this case it is difficult to escape from the many unemployed, and that is used as an opportunity to deceive them.