Same, they must not have rolled it out to everyone, I have firefox/ublock origin on PC and android and have yet to see an ad on youtube, and the quality and speed of loading seem to be fine.
I doubt they would ever do this, but I wonder if they have some metric about the user’s likeliness of clicking ads, and prevent more ‘advertisable’ users from blocking the ads but let some keep blocking them because it wouldn’t make as much of a difference, or they would just leave youtube. If my adblock stopped working I would stop using youtube, without a doubt. I am allergic to ads.