Interesting. I very rarely search whole albums on YT but often rock and metal.

Start with a random metal track in mind an I find I get a band mix suggestion, a nordic folk metal mix, 11 more tracks from the same band, 3 tracks I listened to very recently, 4 connected other artists and "5 CREEPIEST Old Found Footages - Recommended for you" as a perfect example of the crap being injected recently. They must notice I've never once clicked one.

I do clear cookies and history periodically, so perhaps not having a multiple year history counts against.