Yeah, there are a few legitimate sites, but it's difficult to earn any significant amount of money and sometimes they take a while to process. If you really need $20, though, it could work.
Often they also have various offers, e.g. X dollars to try a website--those usually pay better because they require a credit card, but it's extra hassle (canceling during the trial period, making sure you actually get credited) and you have to be careful. I've yet to run into an outright scam (a decent survey site won't link those), but many of them are "legitimate" with quotation marks.
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