I don't get the gripe. EME is used solely for wrangling media bits and it doesn't insist on any specific CDM. It's up to the browser manufacturers to decide if

I don't get the gripe. EME is used solely for wrangling media bits and it doesn't insist on any specific CDM. It's up to the browser manufacturers to decide if they want to include any closed-source implementations. The fact that commercial browser manufacturers include their own closed-source implementation makes perfect sense (IE = playready, Safari = fairplay, Chrome = widevine). If ARRI decides to create a web browser, would you expect them not to allow their end users to natively play ARRI raw files if they could provide it, simply because other browsers can't include that closed-source capability? Seems to me like an arbitrary restriction. If I want to use open-source-only browser, and lose out on some of the proprietary commercial stuff I get elsewhere, that's a respectable choice, but it shouldn't be the only one.