In the current situation, it seems that casinos focused on sports betting will begin to lose interest. This is especially evident with the increasing popularity of prediction markets like Polymarket and many others emerging. The advantages of prediction markets include privacy, no KYC requirements, and higher profits compared to casinos.
You are overthinking this, and some of your claims are wrong. For instance, Polymarket is not KYC-free, and this is applicable to lots of them, except those ones that are hiding under some DEX's style to operate.
Now, about the operations itself, first, prediction betting is some form of gambling, so it's still within the industry. Second, you have to acknowledge the difference in industry styles. Many people that cannot indulge themselves in the regular casino gambling style are increasingly indulging themselves in the prediction style. This increases the success rate of the division, but it's no treat to the existing gambling way, since their systems are different.