I guess it's because of the business rivalry between fellow gambling platforms who want to see their rivals tampered with on their competitor's sites.
The DDOS attack will temporarily attack the gambling site but if the gambling site has a qualified security team, the DDOS attack will not affect the site.
We will never know who launched the DDOS attack and can only guess.
That is why a business on the internet must have a security team who is an expert in their field to deal with DDOS attacks that will come to their site.
That is the type of thing that makes it a lot worse for other casinos though. If I had a casino, I would rather see my competition line at all times and doing their best and losing, if there is an attack then it could rally people behind it based on the attack and use it to victimize itself and that could get attention from people.
Maybe I am wrong and these attacks scared off some gamblers, but if Duelbits could talk about the numbers, I am pretty sure that they are getting probably more people now. Mainly from what I am feeling, I do not know if others feel the same way, I just feel like gambling more here because they have been attacked like this.