People are normally born with equal ability in both arms and legs, but normally you begin favoring one arm or leg to the other. Everyone does this. Pretty much all players football or freestyle prefer one foot to the other. It's only natural. There are some who have managed to make their weaker foot closer to the dame in regards to their more dominant foot, but it's still weaker. I don't think anyone is completely two footed, because even in the best freestylers and footballers you see them favor one foot at least on certain techniques. Now, the more you practice with both feet the less likely you are to favor one foot.
I've managed to make my weaker foot quite good at football techniques like shooting, passing, receiving, and dribbling, but I can't do almost any lowers tricks with it for the life of me. I think it's that I've had over almost 2 decades of training my left and right feet at football techniques and only about 3yrs of training my feet at freestyle techniques.