What kind of work can be found on Amazon's MTurk service?

I thought about getting into Amazon Mechanical Turk as I saw it was the most "profitable" from several sources. I however never found any information regarding what kind of work can be found on it or how the entire system works. Any information would be much appreciated.

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source https://www.reddit.com/r/beermoney/comments/mxke5x/what_kind_of_work_can_be_found_on_amazons_mturk/