I’m not sure that’s right?
I think the limited liability is for debts to creditors and shareholders, rather than limited liability against criminal or other behaviour.
Maybe I’m wrong, but as I understand it, Australian law treats a corporation as a person and the directors are answerable if the corporation breaks the law.
The real problem (as I see it) is that a company the size of Optus can afford to defend their behaviour for so long that enforcement itself becomes a burden. The closer you get to the CEO and board, the more they will spend shareholders money defending themselves.