https://support.na.square-enix.com/f...&la=1&ret=rule
"Please note that Square Enix may issue a penalty at its discretion even if a report has not been filed but the act was found being conducted in public areas such as Say and Shout, search comments, Party Finder, on online video/streaming services, if the behavior is found to violate real world laws, or if it may be considered a problem based on the game's entertainment board ratings."
People like to say well ESRB doesn't cover online interactions, that is to a certain extent, like chat rooms. But performing acts using FFXIV assets like your character and content such as screenshots and streaming is still under SE's copyright and purview with ratings and local laws.