If a Casino has the functionality to have an app and if the Casino is strict on the kyc ,it is obvious that in the App it will require the kyc from you in the same way. In a casino App you should focus on security , it should always be at the highest level because it is easier for hackers to extract the person's data , this is something that has always been reflected , in fact I have read many articles that there are people who steal their wallet private keys because they accessed their Phones without any kind of permission and stole everything.
Maybe casinos don't need to release their casino applications but focus on developing their sites that can be accessed via people's phones because creating a casino application also requires additional costs. If the casino has just launched, maybe the casino can think about it later because the most important thing is how they can promote their casino to the public.