Regarding DRM on Apple Music downloaded tracks, I just did an experiment.
I took a song which I ripped from CD and has been matched in my Apple Music library, and made sure that the file on my computer was downloaded from Apple Music, rather than the original rip. I then copied it from my iTunes library to another directory in finder and tried to play it using quicktime. It plays fine.
As far as I can tell, this is a DRM free track which I would be able to keep and play if I cancelled Apple Music, just the same as is the case with iTunes Match. That would seem to be in line with the reports that Apple Music matched tracks no longer have DRM.
Unless I'm missing something.
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Uploading and matching aren't the same functionality. Due to licensing, there's no doubt that Apple Music would only match tracks (i.e., provide you with a higher bit rate version of the same song) that are within it's licensed catalog. That doesn't mean that songs not matched couldn't be uploaded to iCloud. However, like I said, an Apple Music match is not DRM free and will disappear from your device if you cancel your subscription.
We are talking about two totally different things here.
You are talking about things like providing higher bitrate versions of songs you own for example. You may well be right about that being a benefit of iTunes Match over Apple Music, although I question the relevance as we are discussing a situation where people have previously had iTunes Match anyway, so could have gone through that process beforehand.
I would however agree totally that if someone is reliant on iTunes Match for things like that then they should keep their subscription to iTunes Match up, if only as a safeguard.
However, I am just talking about the ability to have your library available in the cloud (whether matched or uploaded). In that case then there is no reason that I can see for keeping both services. From what I can tell, the people who have been asking the question on this thread seem to be concerned about the availability of the library, although I may have misunderstood.
I'm not sure at all about the DRM issue though. My Apple Music matched files look DRM free to me.