The rules say:

>>>1. ELIGIBILITY

>>>NO PURCHASE NECESSARY TO ENTER OR WIN. ALL ENTRANTS MUST AGREE TO THESE OFFICIAL RULES AND HAVE A VALID SQUARE ENIX FFXIV ACCOUNT FOR THE NORTH AMERICA REGION FFXIV PLAYERS...

Those that have a valid square enix ffxiv account in the north american region, but are banned from the forums, how can they enter?