It’s not secret, because they’ll be provided an answer if they email the mod team.
It’s not free as in open source, because it isn’t available for anyone to download and study in full.
So, since it’s not secret, is it public, or private? Since it’s not published in full but any query of LIMIT 1 is answered, is that open, closed, or other?
Restrictions to publication don’t necessarily equate to secrecy, but the best I’ve got is “available upon request”, which isn’t quite right either. Suggestions welcome.