Why is there no iOS app?

Because Apple, in their infinite wisdom, decided that no drinking games are allowed on the App Store anymore.

Apparently, iOS users are not allowed to have some fun 🤯

Apple's response:

Technically valid. But hey, you are a grown-up, you should be allowed to make your own mistakes.

You can rebel against Apple by installing this app offline. Same great behaviour like a native app, but no App Store BS!