Are online surveys a scam?

Episode 1534 (36:37)

Dawn from La Puente, CA
Computer with cash

Dawn signed up for an online survey. Is it a scam? Leo says that as long as she doesn't give them any credit card or bank information, or suggest software installation, she should be fine. All she's doing is wasting her time. She probably has to jump through so many hoops that she won't really make money for a long time.