Community creation is easy. It takes mere seconds for a creator to spin up a server for a new community. Invitations are easy to send and accept, and creators frequently hook new members by offering special experiences such as “movie night” or “gaming sessions” for their Discord members.
Huge groups defeat the purpose of community learning. You lose the sense of a group if it is too large. Based on our experiments, a cohort of around 30 students is a good size to provide enough variety in the group but still makes it feel intimate.