What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!
3) Established members who have not yet achieved the success they want but have not yet woken up to the possibility that they are wasting their time, and they treat it like a paid version of Facebook, forever posting personal and motivational updates to fill their day so they can lie to themselves that they are actually doing something productive with their time.