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...the next pick to the people who saw you pick the "winner". Now half of those people see one team, the other half see you pick the other team, and whoever saw you pick the winner thinks you've got a 100% accuracy rate over two games. You could do that for a while and then offer to sell your pick for the Superbowl. Starting with a big enough group in the beginning, this might be really lucrative.
But is it legal?
After your shit gets raided and there's evidence that you sent out two sets of information to different people... Yeah that's extremely probable.
You don't understand how much of an electronic trail mass mailing would leave. If your mark and a burned mark were on the same email provider, a warrant would uncover this extremely simple scam.
I understand completely, you would need a reason to start investigating them to begin with, and that’s pretty easy to claim after, but during how would you know frauds happening…?
You aren't making much sense. You are asking how people would find out they are being defrauded before they are defrauded.