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YouTube Premium just got more expensive again: now $16 a month, or $27 for families
(www.techspot.com)
This is a most excellent place for technology news and articles.
I know you can sign in with your youtube account. You might be able to port them to youtube music and then see them in metrolist if that makes sense.
Now that I think about it, if the playlist are indeed stored on Google's servers, I could probably also use google takeout to require my personnal data. It's what pipepipe/newpipe uses to dump subscriptions from YT.