The strategy tends to work well when the group of companies being brought together are similar enough that they can benefit from shared, scaled out fixed “infrastructure” across core business functions but are different enough (end customer demographics, positioning/brand, geography, etc.) that they don’t encroach too aggressively on one another.
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.