"earn $3000 per week just by joining our site".is it possible and do you believe

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i've come across a large number of ads on the internet like this and they design their website in such a way that it'll convince you.in what way they can give every member $3000(is it by robbing?).they just wanted people to register with their site so that they can earn money.if i'm wrong,then could anyone explain me how?