I think they meant it as a "necessary evil" because companies could start implementing their own drm and make everything more difficult to crack. Also without it, companies would not trust it without drm due to the greed.

"Don't work at all" in Firefox, when Chrome implements the DRM the service insists upon and Firefox doesn't

and

"Don't work at all" because the services can't exist without DRM

are very different assertions.

I think you're (rightfully!) doubting the latter, but the person you replied to meant the former.