Why would you want to be a part of a >100 user chat in the first place? I don't know anyone from my colleagues or friends who are taking an active part in such

Why would you want to be a part of a >100 user chat in the first place? I don't know anyone from my colleagues or friends who are taking an active part in such groups. Largest group I have on WhatsApp has a few dozen people, and after some invisible threshold being passed, activity in the group drops, as people are hesitant to chat with so many unknown people.