The most common used wagering requirement for withdrawal without any bonus is 1x-2x, 5x is a bit rare but I know some casinos with such requirement.
About the casino mentioned above, I have never tried it as it seems to be less popular casino.
Better to stay in most reputable casinos with standard 1x-2x wagering requirement for withdrawal.
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!!
5x wager requirements even on a first deposit is outrageous to be honest, I won't say that I've never read about some casinos asking this much, but I personally have never encountered on played on a casinos where such is required for a gambler to meet with before he or she can request a withdrawal, I think the highest I've come across is 3x; which I even considered too much since it was without any bonus claiming.
The normal wager requirements on first deposits should be between 1x and 2x, it should never be anything more than this, except on occasion where the gambler is depositing to claim a bonus, then the X can be higher depending or according to the terms and conditions of the bonus, which also the gambler should be made to read before accepting.
I personally will not trust a casino asking a wager requirement of more the 2x without bonus.