Why do you assume they didn't? And if they did and the industry said no, what should they have done? Walk away, lose access to all its content, see a large part of their subscriber base move to different services that do support DRM and therefor get the content and eventually have to start firing employees as their income drops?
Just about any streaming service has this exact same problem. They don't love DRM nor want to support it, it's annoying and cumbersome. But it's how you get access to the content. And unless you can survive purely on your own content you don't really have the option to walk away over your ideals.
If you want DRM out of the system, convince the content/rights holders that DRM isn't in their best interests, i.e they can make more money without it or at the very least won't lose money over not having it. If you're hoping that somehow a significant enough size of the population will boycott it for the industry to change, based on the ideals of the open web and open access, you'll be waiting a long time.