I have read all of your responses regarding this matter and it seems that everyone agrees that a x5 wagering requirement for withdrewing your own deposit and no bonus is simply unacceptable.
The casino is able to put whatever requirements they wish on their bonuses and deposits. We don't have to agree with them and we can choose to play elsewhere, but IMO a 5x wager requirement on a deposit is very bad for players. They're not scamming by having these terms, they're just a casino that's very hard to win on with these terms.
There are actually other casinos that ask higher than the 5x wager requirement. I once joined a casino without any wagering requirement upon withdrawal but suddenly they changed their TOS because they noticed that some players are just taking advantage of the bonuses. They even asked for 20x the withdrawal amount which is why lots of gamblers have left the said casino. This simply means that casinos could add or change any of their rules at any time.