Hey @GooglePlayMusic users 
Starting today, you can seamlessly transfer your audio library and personal taste preferences to #YouTubeMusic with a single click. Access is rolling out now, welcome to your new home for music. More info here → https://yt.be/NJiv pic.twitter.com/9mnLTT0Z3p
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So not only did you remove
@GooglePlayMusic and put it on a worse service, you jacked up the price for offline mode. I don't use playlists and I have uploaded songs, what happens then? Do I still get to move my music?
Yes, you'll be able to transfer your uploads & purchases, stations (known as playlists on YouTube Music), thumbs ups and thumbs down (likes & dislikes on YTM) as well as your saved library (albums, songs, artists) from GPM to YTM. More details here: https://yt.be/help/JZwH