That is because typically we do not allow polls on the forums. Due to that, forum accounts are not flagged to create them. However, Malckiah managed to find an issue we had with some forum permissions, one that I didn't know existed, and he was able to post this poll. Imagine my surprise when I saw it in GD
I don't even see that option when creating a thread.
That issue has now been corrected and so poll creation should not be an option that anyone can see. Since this poll is already live though, I will let it ride!