It's a non-commercial advertisement. This is protected under the Creative Commons License that SE has on their own website. https://support.na.square-enix.com/r...5382&tag=authc
"Square Enix Co., Ltd., and Square Enix, Inc. (collectively "Square Enix") grants you permission to utilize certain materials as specified below (the "Materials") on a non-commercial basis, for the purpose of supporting and developing the Final Fantasy XIV community, in accordance to the following terms and conditions.
Copyrighted and Trademarked Materials
This License applies to the following Materials:
All art, text, logos, videos, screenshots, images, sounds, music and recordings from FFXIV; "
Arm-chair lawyers on twitter/discord/where ever that think they know the legality of that billboard have no idea how actual copyright law works and probably haven't even taken a moment to look at SE's own actual Creative Commons License.
The people who made the billboard could be suspended or banned from the game, however, because they have obviously infringed on the TOS for misrepresenting the game with an SE trademark. But.. being sued? Get a grip, lmao.
