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How does anyone ever take “offers” like that seriously? Why would anyone ever be taken in by such false advertising? But it can’t actually be false advertising, because it is everywhere.
Even if the law says that a prize has to be available if such an offer is made, you have usually been given no idea of the number of people who will enter and you have no idea of the odds of success. You would be foolish to enter, if you are trying to win.
I guess it’s a bit like the lottery. If you want to enjoy the “thrill” of gambling then do it. If you want to win then don’t.