Interesting. I haven't noticed it any myself. Though I watch plenty YT. It could come down to content type or even upload date. Will have to watch when I get home. Though honestly a good portion of what I "watch" on YT are podcast type things where the visuals aren't that important. PBS Spacetime is one of the few I pay close attention to visuals on. As its often the main way I'll have a good chance of understanding the discussion lol.