Here's a website that tracks the vote manipulation on the White House YouTube channel.

https://81m.org/

Original content. I noticed some discrepancies on numbers right after he took office, and it was really pissing me off, so I've been snagging screen shots of various White House vids for the last few weeks. Every one of them has downvotes removed after a few hours. I never paid attention to the downvotes with Trump, but his upvote count was always much much higher than Xiden's.

Here's some more analysis. It's from a while ago but quite good.

https://phzoe.com/2021/01/27/white-house-youtube-dislike-manipulation/