Media DRM is not and never was primarily designed to prevent piracy. Rather, DRM is used by content producers (Fox, Disney, Warner, etc) to assert control over the rest of vertical market. This article is a prime example of this. Thanks to DRM the movie studios force browser vendors to sign agreements to get access to the CDM, and from that agreement they can assert control. They can subtly suggest, for example, "Hey, Mozilla, could you revamp your plugin API to make blocking ads harder? It's fine if you don't, but, oh, by the way, your CDM agreement expires next month. Looking forward to seeing you at the re-negotiation meeting."
The same thing goes for encryption on Blu-ray discs, which forces Blu-ray player manufacturers to sign agreements with them. HDCP on HDMI and DisplayPort asserts control over TV manufacturers and infests video cards.
This is the same industry that pushed the DMCA on us, extends copyright in perpetuity, sues families because their kid downloaded an MP3, would like nothing more than SOPA to pass, etc, etc.
I know that the comments here like to demonize Google, Microsoft, Netflix, etc. Honestly, I don't believe it's their fault; Netflix in particular. Netflix is in no position to fight this. If they say no, the media empire will pull all their licenses and the company will collapse. And Netflix is already fighting for its life against these same companies for net neutrality (the major ISPs are owned by the media empire...). Google is leashed by its need for advertising revenue. Microsoft is beholden to its customers, who want access to DRM'd content.
In other words, we shouldn't be taking our fight to the W3C, Google, Microsoft, Netflix, etc. The media empire is the real enemy here. And there's hope. The rise of cheap, digital cameras and distribution platforms like YouTube and Twitch have enabled a wide array of independent artists to create AAA content mostly unbeholden to the incumbent media giants. Some of the best and most entertaining content I've watched has come from Patreon funded YouTubers. If that was the only content that the world watched, the media empire would starve and whither away, and DRM along with them.