Hai
well, when the surveys are received it's only a limit time target or # of participants to be attended the each survey's.
When attending the particular survey the basic information (various company's survey like Toluna, cint, yoursurveys, opinion world... &
surveys profile page) about the persons are true and the answers are based same on that, it's only the my point of view. You please read the forum variety of answers are there... thanks for the question
Best of luck