Well, the author proposes the algorithm used should be open, i.e. known to the user. But this means the user will try to game it, so the creator would prefer to

Well, the author proposes the algorithm used should be open, i.e. known to the user. But this means the user will try to game it, so the creator would prefer to keep it secret. The big question is: can we make a transparent algorithm that can't be gamed (spam, SEO, etc.)? As cryptography demonstrates, this is definitely possible, but requires a lot of research, smart design and may not be cheap to implement.