The purpose is to avoid hassles in shortlisting the CVs and calling deserving candidates for the selection process.It reduces the time involved also.So, mostly they are genuine while few deteriorated minds use this method to get their wrong motives solved.
However, where there are good plants, weeds are also there which need to be weeded out time and again.
Opinions would always vary and those who were able to get the right ones would have a positive view and exactly opposite would be the ones who were victimized by the fake sites!
I know an individual earning well on Liveperson.com This site enrolls consultants for various jobs. You provide consultancy either through email or chatting. He is busy almost entire day as he continues to get messages for online consultancy.
There are fake sites also. So, we need exercise care.
No online job is trustable . Never try to join by investing money. Before joining first completely inquire and find is anyone profited by that job or not then you proceed