For me, there are 2 specific things that annoy me to no end with it. 1 is my guilty pleasure, I love watching hour long videos from Asian channels where they just film restaurants or bakeries making food in large batches. Honestly, youtube seems to actively remove them from my feed. I have to search for them every 2 weeks despite watching this content at least weekly. The second is the opposite. At Christmas I searched for a video of a fireplace with music to put on as ambient background for dinner. My feed is chock full of 8+ hour music playlists now despite never having looked at another one. It's been 4 months.

I don't know what it is but i swear they have content they like showing you and content they dont like. If you want the former your experience will be OK. If you want the latter then they just decide you're wrong and still get the former.