I am not quite sure the difference between "not interested" and "don't show me this channel" option? Does the first affect the recommendation engine, and the 2nd only blacklists a specific channel from being shown to you?

Also, I don't know about anyone else with the same preferences/obssessiveness (I admit it's a bit futile in the bigger picture), but I've tried to give Youtube very strong/steady feedback about the videos it suggests to me (mostly in the negative direction), and it seems I've almost painted myself into a corner with being shown the same videos every day on the YT front page.

I have no idea how long the feedback to their recommendation engine lasts or whether it tails off with time, etc... Or whether it's really worth me continuing to do so vs. opening videos in incognito mode, etc. is more effective.

I had this weird video recommended to me of some Norwegian lady interviewing some guy who is a psychic medium. The whole channel reeked of woo.

Haven't seen any more since I hit "Not Interested"

I keep trying this with Jordan Peterson videos, but somehow YT thinks I still want to see them.