@TeamYouTube I've noticed some users violating the AdSense rules which forbid placing ads on a video already containing sponsor offers, but I can't find a relevant branch under the report button. I've tried reporting under other categories, and it never gets addressed.
Hmm, you can report a channel with inappropriate content by following these steps: https://yt.be/help/dH3L . If the option you're looking for is not listed, go to About > Report user > None of these are your issue > then enter your feedback in the space provided. Let us know!