there is nothing that can be done to stop the scam, unless we do our own research beforehand on what we want to invest, no one forces you to buy anything here, this is purely the responsibility of each individual.
as for this forum has stopped many of these activities but it is impossible for all of them to be covered.
I believed those copper membership managers who manage projects in these forum do so to bring some credibility to those projects so as to attract bounty hunters in participating or promotion their projects however these are some tricks which will eventually turned to a scam in most cases however researching deeply about some of these projects will help hunters to detect scams or fraudulent ones however its a pity many hunters don't bother to check for these facts before working for them