There are many. To be honest many user are not very open to their winnings and do not always want to share here on the forum. Though the accounts itself is private they still think it would expose them somehow.
There have been so many winnings such as 200 dollar free roll. That has been published many time by users and I think that’s the highest prize you could get on freebitcoin for “FREE”. I think that’s already win win for forum user to rest of the world user ratio.

Sometime I do feel that every user on freebitocin might be already present on this forum itself. It’s crypto so we never know !