In my informed opinion, I believe that Allpoetry.com is a vanity poetry site designed to take advantage of the egos and wallets of amateur writers. I was a paying member who left the site due to my personal experience with rampant plagiarism and selective rule enforcement by the owner and his moderators. I was not banned as Kevin Watt's reply would imply. In fact, I only left the site after numerous complaints were ignored or mishandled.
I have numerous complaints regarding the site. I feel that the contests are rigged and many of the members have a cult mentality, especially those in the site's larger groups. I also feel that the site is a major source of misinformation regarding poetry and poetry forms, and the site's front page does not accurately reflect the best poetry that the site offers. The site's "classes" are also largely "taught" by members who have zero qualificaions to do so. The site also has its share of trolls, but at least they can be blocked.
As a published, award winning writer, my advice is to steer clear of allpoetry.com.
We've responded carefully to every complaint about plagiarism, which is very rare and taken very seriously. It's hard to match users to sitejabber users, but I believe this user was banned for other reasons and is lying in an attempt to hurt our reputation here.