I would assume that a company as big as Sony has its own legal department, and probably other attorneys on retainer. Dealing with a lawsuit brought by an angry gamer is unlikely to cost them anything, as they have to keep legal staff employed anyway. And if you file a civil lawsuit you will need to prove damages, and I'm guessing that the extent of damages that you could recover would be the cost of a month's subscription. How many lawyers would agree to represent you for a cut of a $15 settlement? And how many judges would allow a $15 lawsuit to get past a summary dismissal?

(And no, don't mention class action, because the same considerations apply.)

DISCLAIMER: I'm not a lawyer, but I did stay at a Holiday Inn Express last night.