The no longer existent corporate person is responsible. Same as if a real person copied all your info, published it, and died.
Imagine if CompuServe still existed, but they had undergone 100% employee turnover in recent years. They'd still be liable, right?
It seems to me that when Verizon bought CompuServe, they calculated that its assets minus its liabilities totaled less than the purchase price and hence it was a good deal. If we treat leakable data as a legal liability, it should send the right financial signal - eg, maybe as a company you don't want to collect much.