I believe, although I'm not a lawyer, there would be some liability, but I think a lot depends on intent as well. Punishment for other crimes also varies depending on whether it was an accident or not.
I realise that in this case it was OpenAI being responsible for their agents running wild, and they should know that that is to be expected and should have saveguards in place. If they can be shown to be negligent then the punishment can probably be expected to be a lot more severe than if it was an accident. I make no judgements as to what this particular instance is, but I do believe that OpenAI has a far more greater responsibility for its agents running wild than someone running a home lab.