The online gambling is one of the most promising industries. However, gamblers are subjects to several issues such that regional-restrictions, time, manipulation and even hack. On the other hand, gambling websites are also under the threat of fraud, hacks and huge monetary transaction fees due to third-parties. Nevertheless, blockchain technology has great potential to revolutionize the gambling industry.
I think some of the items you mentioned that gamblers are endangered to are the likely reason that casinos and gambling site are trying to introduce some security measures in the form of KYC but most gamblers feel is a delay especially when trying to make withdrawal but it is a protection.