Having said that anecdotally I'm sure google do ip/wifi network tracking as after I was connected to a friends wifi network while he was in the process of moving house I began being served ads for moving companies even though I had done no similiar searches or visited related sites.
The recs are poor enough that I don't mind blanket-banning an entire channel from my feed. Youtubers so frequently "compete" by using clickbait titles and thumbnails, I'm glad I at least have this method to punish that kind of behaviour.
If you are subscribed to enough good channels, you won't notice anything aside of suddenly having much more free time. And whenever you're bored, unlock recommendations for a while to learn about new channels (I do it once every few months).
[0] https://github.com/TeamNewPipe/NewPipe
[1] https://vanced.app/ , beware of scam sites
[2] https://apps.apple.com/us/app/ivory-video-player/id129434748...
[3] https://www.youtube.com/feed/history (on old YT layout)
This has never worked for me. I've tested this while signed in without blocking anything - "not interested in this channel" has never once caused a channel to not be recommended to me.
The same thing happened to me except I'm a cis woman and my front page was filled with transgender posts/subs. Reddit seemed to conclude that the only reason I could possibly be interested in DevOps is because I'm actually be a man.
For example, the wiki.debian.org blocks users of (at least) privateinternetaccess VPN. (You get a 403 forbidden. This doesn't happen when I use my personal VPN routed out through a VPS provider, only through PIA.)
I have encountered this with various other sites as well, both outright blocks and degraded experience.
Frustrating. Although I don't really trust VPN providers, I trust my ISP even less, and a VPN helps me get by some of their more heavy handed shaping.
I also gets recommendation for videos that my SO watches even though we don't use the same computer. It's rare but it happens.
> Even if you opt out of Ads Personalization, you may still see ads based on factors such as your general location derived from your IP address, your browser type, and your search terms.
Could just be "We don't know anything about you but these things are generally liked"
Besides that, I have block the whole recommandation landing page that Youtube gives you with uBlock, since it was huge distraction for me