If rolled out widely, this would make web browsers and third-party YouTube clients without a DRM license unusable for YouTube playback, download, etc. This would include almost all open-source web browsers and almost all third-party YouTube clients. Archive link to reddit post about this
Its a shame that content creators don’t truly own the content on YouTube and can simply opt out of DRM on their videos.
Also weird timing considering boycotting is a common topic right now.