There have been a lot of fraudulent allegations against several casinos out there and some are true and some are just false accusations, Most of the accusations are made by new users on this forum.
Maybe they assume that they can solve their cases and problems here so choose to provide statements of accusation in various feedback threads of the gambling section of this bitcointalk forum.
What you said is correct, that for every accusation there are details and proof of the truth of the fraud committed by the casino so that we can all believe that fraud was indeed carried out by the casino.
Maybe @mosele should provide even more accurate details and evidence if he is a victim of a scam casino.