I have googled it a bit and it seems that DRM is not used any more on iTunes:
https://en.wikipedia.org/wiki/FairPlay#iTunes_Store_DRM_chan...
In fact, as far as major services (e.g. major distributor and not some niche music market with "indie" artists only) iTunes was the one that spearheaded the un-DRM of music (with Steve Jobs' call to end music DRM: https://betanews.com/2007/02/06/apple-s-steve-jobs-calls-for... ).
of which at that time there were only 2 or 3.
Why did Jobs do this?
Countries in the EU were demanding that he do so if he wanted to sell product there. Jobs was not interested in dropping DRM until the countries started bitching. Norway banned the iPod due to the iTunes walled garden creating captive audiences without opportunity for choice in media vendor (due to incompatibilities with competition services) and France started slinging similar threats.
It all seems so altruistic in hind-sight, but really he (Jobs) was being pressured by the nation-states, and he had the opportunity to look like a pioneer by dropping DRM (an endeavor that Apple felt pretty keen about with FairPlay) -- making the competition look petty and selfish for having DRM, while simultaneously satisfying the desires of the nations with markets that he wanted to compete within.
The whole story is in that link you included. I got a different vibe from the article than you did, I think.
However m4a files are lossy and thus not desirable for me. If I purchase music I want it in flac/alac format because I can transcode it to say, m4a if I need to in the future, or any other format. You can't do that with m4a without a degradation in quality.
iTunes does not have DRM and is the only reason i buy albums through them: after i download the album, i have a bunch of m4a files i can play with any player i want, in any device i want and store on my own external drive.