Every single day, I receive an email stating that I could participate to win a $50 Amazon card, but this is just a way for survey companies to get you to do their dumb surveys and buy some cheap merchandise they will present to you on some of their pages.
Some of these emails they send try to make you think that you have already won the $50 card, but then when you click over to their link, it states that you will be "competing" or "participating" to win the card. I'm sure a lot of people have received this bogus opportunity through their email, because those companies don't have the decency to stop bothering people and making false claims.