Likes from logged in views do count, the like to view ratio is higher due to that.
A German YouTuber tested it with an unlisted video, I can’t find it as of now but I do find a lot of deleted videos in my liked ones…
Basic theory as of the time of the video is that they want to go against bot views. Short views did not decline, only long form video, and of those the people with mostly desktop views are hit the most.
Edit: found it!
I saw Josh Strife Hayes talking about this and I think he was collecting some data to potentially do a video on it? Will be interesting to see the results and if they match up with this.
Yes! The one I mentioned quoted Josh and went further with his research