They know that there are regulatory bodies that visit their website, and these are some of the things they would look out for. Also, they know that people would likely put out reviews for their site and would appraise them either positively or negatively if these write-ups or information were missing. And lastly, it seems like the moralistic thing to do.
This is absolutely right that casino do not care about the gamblers and the most important thing for the casino is to gain their own money. They treat it as a business and the priority for them is to make money 💰💸💸
You all may be right but nevertheless some casinos take it as serious as anything, they don't admit any funny display that could birth in shady acts from gamblers, so they expect everyone to corporate with their system and avoid causing glitches to their network, as a matter of fact, several attempts from the gamblers or any other external constraints constitute to the level of damage a casino may experience with it system when an attacked is attempted by them, this could cost them as well before detection and other innocent gamblers may be affected alongside, part of these are the reasons we see them blocking some user's account by placing restrictions on them when they were being suspected.