League of Angels developer Youzu Interactive Co. Ltd (or whoever is responsible for their advertising) is directly stealing video and audio assets from Final Fantasy XIV for use in promotional materials. This revelation isn’t particularly new, it’s in a footnote on the game’s Wikipedia article. Follow the link in League of Angel’s advertising and it takes you to a Start Game page that will show either a direct rip of Final Fantasy XIV’s Heavensward trailer or the End of an Era trailer alongside the Answers song.
I reached out to both GT Arcade, whose website hosts the videos, and Square Enix, and haven’t received a response from either. I’m going to assume, given Square’s protective nature of its assets, that the usage has not been approved.
Youzu Interactive and GT Arcade are both headquartered in China.
MMO Fallout 
GTArcade is so shady in so many other ways, but China does not recognize copyright so they steal from each other regularly for development.