This is a paranoid slippery slope.

EME existed for several years already, and was implemented in browsers. Standardization doesn't change much.

And no one except the big movie producers even wants to use DRM. If you don't watch movies on the web, you'll never see DRM.

Firefox is DRM-free by default. It will download Widevine CDM if you start watching Netflix, but you can untick a flag in the settings to completely forbid it from downloading the CDM, if you're afraid of accidentally signing up for Netflix :D