Some guy claimed to be doing it to raise awareness to autism or something but was found to be false. I personally believe its the Chinese in an wide spread attempt to see if they can shut down E-commerce and communications in mass. Or simply training their next gen hackers by trolling one segment at a time. Or its gil sellers taking revenge for the bot/account bands and lack of easy income. Or Obama supporters who want to give the fed more reason to assert more power over the internet traffic. Realistically its likely some Troll with an axe to grind by tick'n other people off for no particular reason.

However FFXiv is one of several DDoS lately, WoW, Everquest, and a few others (not just game servers) are having the same problem lately. What I have noticed is XI seems to be immune.. Coincidence.. likely...