YouTube does provide the ability to livestream, and it sounds like livestreaming is one thing that they're upset about, not just commenting.
searches
Ironically, apparently 10 Downing Street livestreams there:
https://youtube.com/@10downingstreet/streams
EDIT: And on Twitter, but that's also targeted.
https://x.com/Keir_Starmer/status/2066416751848706064
I guess that there's Sky News:
https://news.sky.com/video/watch-labour-conference-live-as-pm-to-make-crucial-speech-13441407
And the BBC: