I certainly agree. It is the management's responsibility to secure and make sure that the tests were done smoothly. Gamblers will just take advantage of the site's loopholes and I guess that isn't their mistake. Abusive people will only exist when there are people who would tolerate them. The management must be responsible enough to handle their promotions and bonuses well.
What kind of test you are pertaining? This is not a bug or loophole on the website. The bonus can't be test since it's available on new account. The wagering requirements is what makes this bonus hard to get yet some very lucky users is using this as an insurance for playing since if they can win big then they can get the bonus as well while if they lose, It is just a regular lose and move on to the next account until they finally meet the wagering requirements by winning on the casino.
There's no way to test it or stop it unless they will set the wagering requirements to the maximum that's nearly impossible to achieve.