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
What competing service
Other entertainment. If Youtube makes my head hurt, I’ll go touch grass, watch a movie, read some news, play boardgames, etc.
And if one can’t get out of their phone, then there is Tiktok I guess.