It helps further if either side or both of them could show proof to back up their claims, but sadly at times, since casinos have the system and have locked the accounts of the customers, they have little to back their claims up and I don't see how that is their fault.
That's how it is, and also a player can't be taking screenshots every time he plays to see if he's going to get scammed, those are things that are already in the casino, I'm sure that each casino has the history and even video of how things really were, and that's what should be presented, because it's difficult for both, for the casino and for the player, I think that if it were done that way there would be a lot of transparency, that each game Session could be recorded for both.
In all the time that I have seen and followed up with such accusations and cases, I have never seen where I casinos team come out to publish public any evidence to support why their restricted or blocked an account, they normally say that it is against they privacy right and only the security team have the responsibility of seeing such vital evidence which they use to conclude their investigation before they make any final judgement.
Only the complainant that is mart enough to have saved some evidence in form of screen shots and other documents that have that chance to present them when their are confronted with the questions of evidences.