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I agree with you and I know that maximum gambling sites allow their user to withdraw their fund after 2x wagering. And also I was not aware about this type of requirement that they have to use 5x requirement of the first deposit requirement. I think it is too much. As I had not received/accepted any bonus offer why I have to make such wager like 5x!!
Generally casinos expect you to bet 1x or 2x before you make a withdrawal, so I agree that it is a bit excessive if they require you to bet 5x before making a withdrawal. Of course we are not referring to a specific casino, but usually this falls within the rules agreed upon beforehand when you create an account. One of the reasons I think is; The casino expects each of its new customers to play longer than the average for other casinos.