I do not use the YouTube app on my iPhone, I only browse YouTube in a private window through Safari. And I notice little “inconveniences”. For example, I can’t drag the selector text over more than one word in the search bar like I can everywhere else. The videos will always default to the lowest quality setting, and only offer 720 P as the highest (even when logged in). When you auto play the next video in a playlist, the playlist loads that video, but the scroll location is all the way at the very top again. Google is really good at powdering lots of little inconveniences all over for you when you try to break away from them.