See "Mozilla project exposes YouTube's recommendation 'bubbles'" https://www.engadget.com/mozilla-youtube-bubble-200045382.ht... (and many others, I'm sure)

Just open an incognito and count the van-life videos. Zero. It's all popular lowest-common denominator videos until you start clicking and teaching Youtube about your preferences.

My work and home gmail accounts get completely different videos because of how I use them. At work it's all background music and albums and at home it's more fun stuff.

yes, but now it is finding much better content especially those from up and coming channels relevant to you