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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?
Not illegal, just very time-consuming bc you half your people each time. So you do all this just for 1 person to give you what, maybe $1000? Lol
P.S. I had to check if I was in the NoStupidQuestions community, sorry OP xD
Not necessarily half them. You can inform your guess by looking at sports betting odds. Maybe a weak team is playing against a strong one? Then your split could be 30/70 instead of 50/50