That is, you win $50 and you make a bet of 1.01 you not only take the $50 but you win an additional $0.5, haha, man common sense, these are promotions that seek to benefit the player but the casino also wants to have people betting.
I'm not sure if that's the case or not but if I'm not wrong then the player will take only the winnings not that amount that he/she got as free bet. If that's true then if someone placed a bet with 1.01 odds then that person will take $0.05 instead of $50.05, correct me if I'm wrong but that's why I think about the free bet.