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.
Instagc is by far my favorite site. There are tons of surveys, email sign ups, free sample offers, videos, etc. Once you earned enough (usually about $5) you can redeem for gift cards INSTANTLY. They also have pay pal and direct deposit. As a stay at home mom with a tight income, Instagc has been a godsend. It’s free to join, of course. Here is my referral link: https://www.instagc.com/1232478
Paid survey site companies invest billions of dollars into marketing research online. They always want to find out more intricate details of a consumer's relationship with their product. Whether it's a new television show or just an existing product line, companies like Disney, Samsung, and Sony go to great lengths to find out their ideal audiences.