No winner has been announced yet so we can assume that its still open so if there's people want to join maybe better to submit their entries now.
From the details on the website, the contest will last for 13 days more. So there is still enough time to create your videos and win a share of the $1500 reward and you don't need to own an nft to join.
Why not just use a dummy wallet for a one-time transaction?
I will consider this and I wouldn't need to send back to my personal wallet as I will likely be staking.