I think it depends on the case of the accusation itself. the reason is, if the casinos with big names here do as you say. automatically, the casino will lose the trust of its users and it will hurt their business. So, related to allegation cases. at least someone has to prove it with hard evidence, and if a user just shows screenshots it doesn't prove anything. then, how can we assess and examine it even more so in this discussion.
I'm pretty sure, if the casino is reputable and has a big name. will not take actions that will harm its users, except if the user commits fraud. anyway, if it happened. the one that will get the most big losses is the casino, that way we as players will choose a casino that can be more trusted.
Casinos will never be free from problems and accusations, regardless if they are scam accusations or not, as much as users too especially for those who are unsatisfied with casino’s services and promotions. But as long as every concern will be settled in the later part, that will not be a problem anymore. For reputable casinos will never leave the issues and problems unresolved, they will always resort into finding best solutions so that they will never lost the trust that their users have been giving them to.
True, there is competition in this industry and sometimes competitor uses propaganda against their competitor, one of which is accusing the competitor of injustice and scams. There are also players that wanted to tarnish the reputation of the casino after losing a significant amount of money thinking that they are cheated by the casino and many more.
The thing is no matter where the player's accusation is, the reader should weigh the evidence since casinos cannot disclose much information because they are bound by privacy law. The reason why when they answer most accusations, they only tell some facts unless the case escalates to a higher authority.