I have used https://soundiiz.com/ a month ago to transfer all my music lists from Google to Spotify (yeah, the irony...) after many years of having music subscription with them. I just cannot stand the quality drop (and build-for-cheap-tv normalization levels) of sound on Youtube Music.

Agree, irregular volume levels on YouTube Music between songs is really frustrating. And some even sound like MP3 rips of MP3 rips.

You can get a pretty good csv dump of your play music profile through Google's general data export tool. Their migration to YouTube music is a good opportunity to see what else is out there. I'm leaning towards prime music, since they're a buck cheaper if you have prime (who doesn't?)

I dumped mine due to the impending shutdown. I only had a quick look, but the data format looked atrocious.

I'm not sure you could actually do it worse, mine was a folder for every playlist, with a CSV for each song.

Trivial for me as a programmer to reformat, but useless for the general public.

I can only assume that was an aggressive answer to "what if their playlist is, like, REALLY big?"