That's a trial and error approach for something that could easily be a simple setting.

It also doesn't work if you use an alternative front end or aren't signed in.

Additionally it also depends entirely on the content you view and your viewing enough of it to train the algorithm, which means new accounts or little used accounts have no recourse.

There's plenty of long form AI content lately too. Wikipedia articles make for great YouTube videos, and there's no shortage of them. I've run into several channels lately where it took me about 30 seconds to realize something was off, and checking the channel's history you can usually tell by finding older videos which actually have a person in them who is clearly very different than the narrator in the newer videos, or by just not having any older videos at all.

Every single AI short video that shows up I thumbs down and tell me never to show me that channel again. Doesn't stop like 85% of my feed from being essentially the same AI short videos by users with names like agagin9927385, liafu63836662, or crazyvideos445442..I spend more times thumbs downing and saying never to show this again than I do watching the videos.

Same. I never see AI slop. Or politics. My algorithm is dialed in and my recommended is all bangers.