Oh, thank Jeebus. Youtube's 1080p compression is atrocious.
As an aside, it baffles me how in 2023, there are still so many official movie and game trailers/gameplay videos that are still only uploaded as 1080p max. This has frustrated me most recently with Blizzard and official Diablo 4 material. I would think you'd want to advertise all the hard work that went into your art, and Diablo 4 looks incredible. But no, I have to watch a video with the bitrate equivalent to someone reading the binary data off a sheet of paper out loud.
Luckily, Nvidia's new video super resolution tech is fairly decent in many scenarios (though it could still use some improvement).