Well I shouldn't worry too much, it's not legally valid anyway. Ideas are not protected, while transfers of copyrights are not valid unless in writing and signed by the owner of the rights conveyed.
They can claim the non-exclusive right to use your work, and can certainly edit/delete/etc your pfile and such, but you will retain ownership of any creative work you submit. Your areas, backstory, etc, will still belong to you.
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