they have reputation over the forum and have large group of players on their casino from the forum so they don't want anything bad happening to them as it will directly affect their profits.They will listen to forum members and managers engagement can put pressure over them to resolve it but the issue must be genuine and you should have proofs for it.
Every type of reputation could be broken the moment a place does something wrong. I mean if duelbits doesn't listen to people here and start to do something that people would not be happy about, then they would end up with nothing at all, I would definitely advice people to avoid making mistakes against a casino, but casinos should also be careful as well.
One "intentional" wrong thing done by casinos would equal to them being gone very very quickly, they would start to lose money so much and suddenly go bankrupt because of everyone taking their money out. Unintentional ones could be recovered and they will drop sharply but could build better, but intentional ones can't.