I remember when I was a participant in one of the signature campaigns that gave free bets on the forum, I can't remember that particular campaign but I did win several times some cool cash from the free bet I got. In USD it mightn't have be big but in my local currency that was more than millions and this didn't happen just ones. I have used similar free bets especially spins to win some cool cash but if I'm being honest, I have lost more times than I won with this free bets although I didn't think about them that much since the bets were free and not me losing real money. I tend to take more risk with free bets than I'll do if I had used my money.