As an adult, I can always feel the pull of real life. If I keep watching YouTube or playing video games I know it's going to impact my job, wife, kid, etc. Some adults aren't even that good at regulating this, but I think kids are, on average, way worse about it. Many don't know real consequences or regrets for failing to manage their time.
Although I'll admit I do agree with your comment in the sense that I think I should stop using YouTube entirely. People are discussing how it can really mess with a kid's brain, and I don't feel like I'm immune as an adult. Yes, I have more discipline than a child, but this feels like it can be a cheap acknowledgement made as a rationalization, like a chainsmoker saying his lungs are stronger than a kid's, or an alcoholic saying the same of their liver.