I think so too. An app not available in official app stores is already a red flag. Even with privacy tools, the risk remains, so I prefer to avoid those kinds of apps. Who knows if there isn't something behind it that could steal your data? I don't know, you can't trust just anything these days...
Although it is not officially released and is not available on the play store due to regulatory reasons for some countries,
the gambling mobile application will usually be available on the gambling website, and it is only a matter of choosing what type of OS Android or iOS is using, so it is not a red flag.
But if the application is obtained from the black-market and it is not clear, it can be very dangerous because it is possible that the application has been modified.
And application installation will also be protected by Play Protect on Android and will be detected if indeed the application is malicious.
If the website display is still good enough and responsive for mobile, now the browser can be an application that can be embedded,
so that it is no different from the installer application and the fungi are almost the same.
Gambling websites today have thought about UI/UX for mobile so that it is more responsive, easy to use and suitable for all devices.
As I tried on
duelbits.com website via Android Chrome Browser, Just with the browser the display is very responsive and the website page duelbits can also be installed from the Browser,
so it doesn't take up much space and is more suitable for users who don't want to install heavy mobile applications.



And For Privacy, I use a VPN to disguise my IP, For KYC will only be optional for those who want to withdraw large funds from gambling or those players who have more money or win the jackpot.