On a survey they make you answer questions to test that you are consistent so if you answer wrong the second time you get disqualified plus survey sites just asks a lot of information that may also invade your privacy and if used in a blockchain the public can see it and you will get a problem on that issue @ura-soul
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It is true that surveys that include privacy would not be suitable for this purpose, but there will be some scenarios where privacy might not be such a problem.