If the scam originated from the USA then it is easier to pursue with court cases I think. But if it is outside the USA, I don't think it is that easy as laws are different slightly in other countries.
It then usually depends on each of the country. If the scam busters are from the same country of the project original country than it would be easy for them to file a case against such scam projects but it would be slightly difficult if the project is been operated over the nation boundaries but it is not impossible.
There are a lot of trusted scam busters who are actively fighting scam projects and if there are huge cases for the same project than anyone of them might take it seriously and can easily file a case against the project which would make the project stand in court for an contempt to scam the investors. This is actively making the markets cleaner and scam free.