its because compared to other (older) solutions, it's a pain. you gotta download the APK of the manager, then it's asking you to root your phone or give it an APK of the app you're trying to crack, so I guess I gotta go hunt for a YouTube APK?
too much work when I can just stop watching YouTube, and for the one video per week that's unavoidable, make do with my half-brokem version of YouTube Vanced that's still on my phone.