This happens to me even though 1) I never log in and 2) I clear my cookies daily.
The other day I was looking for recipes and I had to see disgusting video thumbnails of faces full of zits interspersed with thumbnails of the food I wanted to cook.
There's a ublock origin filter here that hides suggested videos and other crap from the search results page https://old.reddit.com/r/uBlockOrigin/wiki/solutions/youtube...