In this case the banning of online gambling has actually resulted in the Government receiving less revenue from tax because the online gambling sites have moved offshore. So I'm not sure in this case that the law has been used for plunder.

I think there was probably some significant lobbying efforts from casinos in the US that contributed to the 2006 federal ban. So someone has been a plundering for money, I just don't think it was the Gov in this case.