I just transferred music I had uploaded to Google Play Music to YT Music because Google is shutting down Play Music next month. A few years ago I had uploaded all the music I had ripped from CDs to Play Music as a form of online backup, and I always appreciated the fact that I could access that music using the Play Music app on my Android devices, and I can cast my music to any of my Chromecasts and Google Home devices. Much to my surprise and disappointment, I have found that YT Music only lets me cast music to one of my Chromecast devices and tells me if I want to cast to others, like Google Home, I need to upgrade to premium. WTF?