I’ve never seen this in the wild, and technically without a link I still haven’t seen it live at all. I’m wondering if the channel triggered some sort of anti-spam mechanism.
EDIT: The only source I can find is from screenshots of right-wing Twitter accounts suggesting something about YouTube censoring anti-vax protests: https://m.imgur.com/dh1kU1q Until someone can link to an actual video showing this issue, I’d approach this with an extremely high degree of skepticism.
EDIT 2: Appears to only apply to live streams from new accounts. Seems like a reasonable limitation to clamp down on the spread of copyrighted material rebroadcasting (people live streaming sports and such from throwaway accounts) and cryptocurrency scams.