Just look at there; https://bitcointalk.org/index.php?topic=1549516.0 , if it is allowed on this forum then everyone will start to open contest and after getting responses they will close it without any winner.
He has every right to stop it without a winner if you read the rules properly. Also I have been reading the thread and I hae not seen any good idea but most of the post there are ridiculously repetitive for the sake of their spammy posts.