People deeply immersed in some technical niche or subculture tend to use acronymms and other jargon unconsciously.
That said, unexplained acronyms (I also wondered and found no likely definition in a DDG search) are an exceeding poor communication practice.
https://support.google.com/youtube/answer/2737059?hl=en
It's an established term to describe org affiliated with youtube/twitch/tiktok/instagram etc.