Does yt-dlp still download webm/mkv? I just see mp4 recently when using a different downloader which only cares about best quality video+audio. Suspicious.
YouTube making their videos more inaccessible is annoying, but I can see this as a good thing. It means that more people will download videos to avoid the eyerot of low quality viewings. I even made a LAN-complete downloader for videos that I don't care so much about. Speaking of, I updated that yt.sh >>10812 - fixed crappy if statement, added restricted filenames options (might share code later).