Exactly HOW are they going to ban the exchanges????

As Xanadu points out the TABS have strong relationships with their respective State Governments and therefore have political power at that level. The problem is the State Governments, as far as I understand it, have absolutely no power to legislate against a betting company not located in their particular state. All they can do is to make it illegal for the citizens within the state to use the foreign operator (ie. like the existing NSW law) and politely ask the operator to put a message on their site - they cannot force the operator to "block" transactions.

The problem, of course, is that they have absolutely no power to actually police the law (as evidenced by the fact that not a single NSW punter has been prosecuted under the existing law since it was passed). How, exactly, is the NSW Police supposed to find out who is using an offshore gambling operator (assuming they even gave a damn - I suspect they have slightly higher priorities!)?

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"Computers can do that????" - Homer Simpson