Large scale DDoS attacks are also increasingly used as a distraction from a main targeted credential stuffing attack, which are now one of the primary type and most lucrative attacks targeted at the gaming industry. Often the online service infrastructure is only impacted as a side-effect, as attackers try to destabilize the web infrastructure as part of their credential stuffing attack.

In other words, it could also be just business as usual. FFXIV grew and is now on the radar of these criminals.