Online casino complaints often arise from issues such as delayed withdrawals, unfair game practices, and unresponsive customer support. Players may feel frustrated when their winnings are withheld or when they encounter unclear terms and conditions. Additionally, concerns about the fairness of games and the security of personal information can lead to distrust. To address these complaints, many online casinos are implementing better communication channels and transparent policies, but players should always research and choose reputable sites to minimize potential issues.