How does GPTbank work?

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How exactly does GPTbank make its profit and how is it set up? I want laymens terms and not some complicated babble like what GPTbank has on its site. Thanks everyone. Oh and if anyone of you know which PTC sites have been around for a while (years) then let me know. I have a PTC section in my forum and am going to make an official list of sites that are trustworthy, established, new, and blacklisted.