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.
Most reviewed paid survey sites effectively promise not to share personally identifiable information or not to share it without your consent. It's an industry standard by which legitimate marketing research firms are bound. But many membership sites reviewed don't make either promise or do so only in a limited or wishy-washy way. Unauthorized go-betweens don't have to honor marketing research privacy standards.
Post-recession, a lot of workers started looking for ways to earn extra cash. While most side gigs won’t supplant the steady cashflow of a regular job, they can pad a paycheck that hasn’t seen a significant boost in a few years. Paid surveys are often mentioned as one way to earn a few extra dollars fast. But are paid surveys a legitimate way to make money – or are they scams? The answer is that it depends on the survey and the company you are taking them for.