Still, funny how you ignored IRCs/forums that I mentioned. Those were used by MANY people, and could scale infinitely. You are literally arguing against something that has already happened.
At its peak (late 1990s to early 2000s), IRC was estimated to have about 3–4 million concurrent users worldwide at any given moment, with tens of millions of total users over time.
Pales in comparison with the scale that’s needed today, given the number of people, variety of media, and bandwidth required.