It may be abandonware, but it works well, and has very few bugs. I hope it stays abandoned in its current state for a long time.
However, there are many severe issues.
* It crashes every single time the app is closed in iOS.
* The ability to edit metadata is missing in iOS.
* iOS integration is missing features that are present in apple music and spotify, such as appearing as a music player in all contexts relevant to the OS.
* Duplicate tracks show up everywhere.
* Playlists often do not update when changes are made to them.
* Playlists sometimes just go missing for a while.
* The web browser interface gets out of sync often.
* It is not clear when tracks are ones in your library or from google's licensed library.
* Uploaded tracks are often deduplicated without warning or notice, resulting in lightly modified tracks and rare releases to be replaced with licensed versions.
* Sometimes I cannot get things to upload without trying a dozen times across multiple days.
This is par for google and it is bar none the the worst software I choose to use.
That being said I went through my Google Play billing recently and realized I’ve spent hundreds and hundreds of dollars on Google Play Music over the years. I don’t think I’ve listened to that much money’s worth of music considering the songs are about a dollar each to buy and I don’t add that many new songs every year.
Someone should build a tool that scans your streaming library on Google Play Music/Apple Music/Spotify or whatever and adds all of those tracks to an Amazon MP3 shopping cart to help you transition off the recurring service. I wouldn’t be surprised if something exists that does something similar using torrents.