Watching video ads: Video ads certainly aren't uncommon in the online world. While generally they're a hassle getting in the way of the content you want to watch, many paid survey sites have turned them into a way for members to make money. It's pretty easy to make a tab, set a playlist of paid ads going, mute it, and carry on with browsing the internet or taking surveys.
They include sites that seem to be their competitors because they earn referral fees when you buy memberships. A couple mentioned in scam forums even try to dupe you into buying the same list at other membership sites they own under different names. Naturally, these sites also have an incentive to exaggerate how much you'll earn from online paid surveys.
“I participated in an in-home product trial study. A coffee machine company sent me one of the coffee makers along with about 200 coffee pods. I received $7 for completing 3 short surveys. Plus, after the study, the company said I could keep the coffee maker. So, I got like 4 mos of coffee for everyone in my household, a free coffee maker and $7!” - David W.