Iam right in assuming the simple Freebitco ID number listed is unique but doesn't reveal anything at all about that user. It cannot be misused I presume or used to unlock any kind of access or data search ? Its only that people are saying well part of the site must have been compromised and in combination with the public ID revealed it has then allowed an attack to be carried out.
If it could be demonstrated how that might have occurred I think it does further the case for you even if its not official; just identifying the possibility would be a big thing in gaining some support and building a case etc.
Well, I do not think there is any sensitive information that can be revealed through a user's freebitco ID, because if at all, anything of importance could or can be obtained from the ID, then I trust that freebitco wouldnt have made the ID public, the ID is just like any user ID on other platforms like stake, bc.game, and even on exchanges like Binance, okex, bybit and so many others, this IDs are not only used to identify each user easily, but can also be used to send or transfer funds from a user to another user easily and free as well.
I do not know if freebitco has such feature that allow their users to send funds to another user fast and free using the ID, but then, i am very sure that nothing of personal and important about a user can be obtained through the ID, else, it shouldnt have been made to be public.