Online Casinos, Gamblings and Scams?

So I was looking up online Casinos (particularly Rushmore online casino) and thinking of gambling, when I saw this promotion saying they would match your 1st and second deposits to a total of $888. This got me thinking, how can the casino protect itself against people just putting money in, then immediately... show more So I was looking up online Casinos (particularly Rushmore online casino) and thinking of gambling, when I saw this promotion saying they would match your 1st and second deposits to a total of $888.

This got me thinking, how can the casino protect itself against people just putting money in, then immediately withdrawing after they get the extra cash? Clearly the house always wins in the long-run, but other than that...

Thoughts?
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