There are a few blacklists out there either free or with paid subscription. Some are sugar specific while others are more geared toward escorting etc.

The purpose of blacklisting is to warn other women about problematic and even dangerous men.

If  someone asks to have access to this information, do so privately and make sure you vet her carefully and that:

• She is indeed  a SB and not a male larper
• She is not some silly bunny who would show it to her SD as in “ Tee-hee. Look daddy, you are blacklisted” (and yes, unfortunately there are women like that)
• She has the emotional maturity to keep the information to herself and use it appropriately. (and not throw it in her SD's face during an argument)

NEVER tell a man that he is blacklisted:  you are potentially jeopardizing another woman’s safety.

Even if you think this man is neither vindictive nor violent, you really do not know how  he could potentially react. This person was blacklisted for a reason. Men who behave decently do not end up on a blacklist.

You might think that you are hurting him by letting him know that he is on a BL but the only people you will potentially be hurting are other women.