I would have thought it's straightforward.
A company wants reviews or market research written etc. Mylot get their users to do all the work. I imagine the company's pay mylot more than the 25c they give the user ;)
That might make sense for the reviews, but not for the tasks I have done. Writing 4 paragraphs on a subject - not a review of a certain product or web-site. That pays $2, so I can't see how they are getting paid for that.