No it doesn't. I and others have used it many times, and it does not actually do that.
When you receive mail that you've been BCC'd on, it does attempt to figure out what address was used to get it to you, and displays that as a BCC (useful if it came to you via a mailing list that was BCC'd), so perhaps you're confusing that for showing the addresses of everyone to everyone, which isn't the case.
When you receive mail that you've been BCC'd on, it does attempt to figure out what address was used to get it to you, and displays that as a BCC (useful if it came to you via a mailing list that was BCC'd), so perhaps you're confusing that for showing the addresses of everyone to everyone, which isn't the case.