Nobody sues dead companies unless there are outstanding claims...

If I owned 100% of the stock for a porn company and shut it down, as a creditor of the company I could simply transfer assets to myself. Claims against a company get settled in the order based on the size of the claim. Even if you own a majority of the outstanding stock in a defunct corporation, you walk away with a majority of assets - without even putting a corp in bankruptcy.

If there are claims its simpler to just negotiate a settlement with a creditor, pay the discounted charge and then keep the content. It's these guys that are continuing to dump content online for next to nothing.