My personal use case is syncing my music to my Garmin watch. I'm a paid Youtube Premium member but Garmin only syncs with Spotify and some other small-fry servi

My personal use case is syncing my music to my Garmin watch. I'm a paid Youtube Premium member but Garmin only syncs with Spotify and some other small-fry services, not Youtube Music. So I use ytdl on a daily scheduled job to pull down every mp3 from my Workout playlist. These get automatically added to my watch when I plug it in for charging. I don't believe anything I'm doing is illegal, or if it is I doubt anyone would care. It's just a way for me to listen to the music I already pay for that works for me.