I don't understand much about these technical issues either, but I would ask you if a betting site as traditional and old as Freebitco.in would really put its reputation at risk or attract the distrust of users and could ruin years of hard work, would it?

I'm not trying to defend Freebitco.in, and I believe their technical claims make sense, but I doubt that Freebitco.in could be exploiting this flaw to gain some advantage.