Thanks for feedback.
This project is in begginer stage so I will not speculate how much money will you earn.
Against cheating.There are 3 ways.
First:Captchas(Yeah,Yeah I know everyone hate them),dont want use text captchas but play game captchas.
Second:Same like VAC anticheat.
Third:My own algorithm.
And ofcourse if someone will have 30000$ on acc he will not get paid so maybe limit.
Someone could fill in the captcha (at least not automatically if its no text captcha) and then let a bot browse.