Search something rather innocuous like "news". Click the first thing then go back to the main page. You have to watch through the ad.
The amount of slop you will get suggested as soon as the algorithm warms up is nuts. The ad you are first served might also be slop. I mean AI generated video advertising overt bogus cures (a memorable one recently - "did you know the Bible has the answer to Alzheimer's?") over AI slop footage.
When I compare to my normal/auth'd Youtube experience, it feels like a totally different app. I have never really experienced such a cheap illustration of the "Youtube rabbit hole" effect. The degree to which AI authored advertising is participating in this is imo pretty concerning if you have, in particular, older parents or relatives.