TBH, I also wondered the same thing and even asked here about this very long time ago and i got some explanations that of course haven't convinced me at all but FreeBitco.in is here for so I leave it with a credit of trust.

I have hard time also to believe in all these wins by newbiesm especially, posting here, so many times, from so many years, because is obvious for everybody that something looks suspicious here.

What is even more important, i have used Freebitco.in for literally few years, frequently, sometimes spinned multiple times a day and never higher price as the second or third lowest, of course that was also VERY RARE event and usually I got the minimum ALWAYS.

I can share my stats here to prove my words. Like everybody,i would like to believe that everything is ok, but from my personal experience I doubt it.