This means that if you’ve matched your library with Apple Music and iCloud Music Library, you need to keep backups of your original files. If not, you’ll end up with files that you can’t play without an Apple Music subscription.
So think carefully if you plan to use iCloud Music Library.
- The Real Difference Between iTunes Match and iCloud Music Library: DRM, mcelhearn.com
Match doesn’t exist separately. Instead, Apple Music gobbles up your iTunes Match library. I’m sure there are some users who don’t care, but your music library is held hostage for eternity even if you bought it elsewhere (if you delete or lose your DRM free originals).
With reports of playlists being munched and the service crashing, Apple Music has been anything but smooth.
/edit: Update: iTunes 12.2.1 appears to fix the DRM issue.