Isn't music one of the easier ones to replace? Spotify, apple, many others.
From what I've heard if you're on iOS you can do this with Apple Music, but that's about it. Everyone else seems to think their collection is good enough that you won't need anything else.
The UI/UX of youtube music is lacking compared to GPM, but at least the file locker functionality that I use is still here.
Is that right? If so, that is losing the best aspect of GPM.
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There's no way to share or migrate liked songs, apparently. And YouTube Music never warns you about the upload limitation before you start using it from "the wrong account".