Is it normal for an online survey to gave more than what they intended at the beginning?

I’m not entirely sure if this is going to a FAQ, but what amount of money do online surveys usually give you when you start to do the survey? Does it vary from surveys? When to know if is a scam?

submitted by /u/Lunenyx98
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source https://www.reddit.com/r/beermoney/comments/dyc2o4/is_it_normal_for_an_online_survey_to_gave_more/