It's funny that this is rarely the case. In movies and TV series, yes, this is how it happens, because having such complex schemes makes the story more interesting. In reality everything is much more simple: fraudulent casinos have bad design, bad support and lame advertising. Spotting them is easy unless you are blinded by some unreal promises.
But most people, I mean newbies, often fall for such scams where when they get a lousy offer or advertisement, they get attracted and make their first deposit. At first, everything looked fine but moving forward, those guys sensed something was wrong but couldn't figure out what. People who have been in the gambling game for a long time usually will not fall for such scams unless their greed is aroused by seeing such lame offers or advertisements.
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What can I say, they should be visiting the Gambling section on this forum more often, and read and learn. I have a feeling that all various issues one can encounter in the world of online gambling have been covered here, and those that haven't will be covered sooner or later. There many gambling related forums, but most the info has no value at all, or even misleading.