My Charter Spectrum Cable TV app runs on Android, but isn't available on Linux.
Spectrum has live TV available through their app and their web site. Unfortunately, the app only works on Android/iOS, and the site only works on Microsoft OSes because it requires silverlight and flash to be installed. The Linux wrapper for the silverlight plugin (pipelight) has been discontinued, so I'm out of luck. I've tried and failed to get it working under Linux with Firefox, Chrome, Chromium -- natively, under wine, natively with the last pipelight wrapper which only ran the plugin through Wine. No dice. It'd be really nice to have a Linux machine to watch all my cable channels on without needing to use a Windows box or a cable box.
I can watch youtube, twitch, netflix, amazon, and a dozen other streaming services on Linux... but, not my own cable/ISP's digital TV lineup. This isn't Linux's fault, of course -- Spectrum should know that silverlight was deprecated years ago and flash is a dinosaur.... but... being that they're a monopoly, there isn't much I can do about it.
There are a few other mobile-only android apps one can't install on PCs -- and even the web interfaces for some sites which have apps lack features which are only found in their apps. (Instagram doesn't let you "like" things from the website, nor does it give you emoji options for instance).