There really isn't much to be done about it at that point. Once a game has incomplete rules and someone knows how to play the game they will avoid repercussions.
That doesn't stop prosecutors from going after those who did leave evidence behind though. When a company pleas guilty to fraud, for example, there absolutely are people that committed the fraud. A company can do nothing by itself, it definitely can't commit fraud without people making the decisions.
(With notable exceptions: Apple and Google were silly enough to have the CEOs emailing back and forth. https://www.theguardian.com/technology/2014/apr/24/apple-goo...)