Sign-up Offers -Credit Cards

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Lately I receive a lot of offers to sign up with these paid survey companies, that really aren't paid surveys at all.To me a true paid survey is one where you're asked for your opinion on various topics and earn either cash or prizes for completing the surveys.The ones I see a lot of, are these promotional surveys, where you are promised a gift or cash for signing up for a product or service and most of these require a credit card. I don't understand why these are becoming so popular lately. Even though lots of people own credit cards, I know a lot of people who don't ,including myself. Also, a lot of people are hesitant to give out their credit card info,for these kinds of promotional offers.I'm of the opinion that most of these sites are pure scams And even if I owned a credit card, i'd be very hesitant to sign up to any of these. What do you think?