> Why does it take a lot of data? Afaik you can select lower quality in youtube-dl but you don't even need video do you?

But you need supervised data too.

I know you can scrape only audio from YouTube with YouTubeDL but it’s somewhat annoying

I use something akin to

    'alias downloadmusic='youtube-dl --extract-audio --audio-quality 0 --extract-metadata'

in my .bashrc

I find that helps with the annoyance of downloading things off of YT. This is for music obviously, but there's an option to download subtitles as well.

EDIT: Typed this from memory, there may be errors in the alias.

    youtube-dl -f bestaudio $URL

Dunno when that went in but it works now.