They don't give out good missions to be able to get any freebies. The last survey I took glitched so I contacted their support. It took 2 days for a response and they wouldn't reset the survey for me to be able to take it to allow me to be eligible for the mission. You do get a lot of emails asking you to take surveys to be eligible but, when you take the surveys, you're always told you aren't a good fit.
So, don't go into this site expecting a lot. It isn't worth it for a freebie site.