Would SH allow creatives to ask this question in a public message?:
“Dear CH: I see that there is a domain registered on your contest. Have you found your winning name or was that not your registration? I ask in the interest of managing my time.”
(or something very polite so they understand that if they have already registered domains in a contest, we know that they are just waiting for the clock to run out).
I personally do not enter contests that already have registered domains in them even though I know that it is possible that the CH did not register the domains. Since CHs are allowed to register domains, I think it would be nice (and fair) if we could ask them this question so long as it is extremely polite.