Do not believe it.
It is not possible to earn $1000 or more using free money. That guy is lying or he might have invested his own money and created the impression with his friends that he is playing with free money.
Yeah, it is hard to believe that he won that much money by only playing free plays. Unless he can show us some proof of his withdrawal that can prove that he actually win using free money and not invested his own money to win that much.