The latter two enjoy government sponsorship or sanction because they are required to send some of their hold to state coffers. Indian gambling is not the only form of predatory gambling in the US: together, lottery and commercial casinos loom larger.
It begins in Maine, where Indian 'gaming' was launched by someone who at first seems to have been more concerned with helping an Indian tribe mired in poverty than turning Indian gambling into a machine to make a lot of money for a few Indians and their financial backers. Reading this book back about 2006 gave me insight into predatory gambling and corruption.
