This is an ancient project. At some point in the past, I went to this site and it was intentionally broken by its developers, such that it would only guess from a small subset of possible targets, and if your character was outside of that, it would act like it knew the answer, but wouldn’t say unless you gave them money.
I don’t know if that’s changed since then, because that experience ruined it for me, and I won’t be going back there.