The "Fortune" app? As you mention knox, I assume this is an app that Samsung force installs on your phone; so I don't really see what Google can do (without locking Android down even more, and I'd rather they didn't).
Google is mostly going in the opposite direction and allowing you to uninstall any apps you don't use [1] -- admittedly, the Youtube app is not one of them on my 6P. But, I can disable it so it's not visible in the app drawer. In fact I can disable all the google apps and have always been able to do so (the only exceptions are non-Google, "system" apps).
Doesn't help if you buy a Samsung phone though....
Google is mostly going in the opposite direction and allowing you to uninstall any apps you don't use [1] -- admittedly, the Youtube app is not one of them on my 6P. But, I can disable it so it's not visible in the app drawer. In fact I can disable all the google apps and have always been able to do so (the only exceptions are non-Google, "system" apps).
Doesn't help if you buy a Samsung phone though....
[1] https://www.google.com/search?q=nexus+uninstall+google+apps