> my feed is nothing but wonderfully enriching videos all tailored to my hobbies and interests
The ad part I agree quite well with. However, I find that Youtube's recommendation algorithm is quite lacking. I mean this is also the case with Netflix and other social media I have used so not just Youtube's fault (only one that sticks out as better is TikTok).
For me, it tends to simply repeatedly recommend way too similar videos. If I somehow happen to watch a video about aa tech review, my feed will be tech reviews and that's it. Heaven forbid I make the mistake of clicking some random political video, and I am now in a hole where my feed is full of right-wing, anti-vaxxers, and conspiracy theorists and so on.
In general, it seems like Youtube's algo gets quite quickly to the local minimum/maximum but then struggles to look around or away from it. This leads to very a insular and locked-in-your-own-box experience.