Do not believe it.
It is not possible to earn $1000 or more using free money. That guy is lying or he might have invested his own money and created the impression with his friends that he is playing with free money.
Yeah, it is hard to believe that he won that much money by only playing free plays. Unless he can show us some proof of his withdrawal that can prove that he actually win using free money and not invested his own money to win that much.
Its a long time already I don't think he still have it or they have a copy of his winnings so its impossible to probe him now.
To win a good amount in free is really possible way back when there still many new casino that want to have players and open a contest that 1000$ is possible if he wins it in a tournament even its free, that's not big money for an event.
Isn't it much possible now since there are lots of competitions, the poker house who wanted to reached more traffics can create tournaments like that to attract players and gamblers to participate. But like what many others have said that way back this can be achieved and there's
really a chance that there's someone here who take that win.