I look for income streams that do not require significant amounts of work to maintain. If I need to drastically increase the amount of product I sell or customers I attract to make good money, and that requires more of my own time to achieve, or cannot be easily outsourced to others (it often increases your labor just to organize outsourcers, so don’t assume outsourcing is a magic solution), that’s not the method for me.
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!