How can we screen a particular internet earning site if it is reliable or not?

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There are so many internet earning site, that makes us excited;Therefore we sign up and start working.But then,the site will be taken down afterwards. A lot of internet programs have started well then ended bad. What a bummer right? One should raise the question, how can we screen a particular internet earning site, If it is reliable or not? It seems to me, that many members here are experienced internet workers...