[tacticalmook]

That's not surprising to me. Discord offers free hosting for a feature-rich IRC and group voice service. Nobody else did that.

A gaming clan no longer needs to maintain their own Teamspeak/Ventrilo server + their own website and forum. The convenience of having it all in one centralized program wins out over Discord's UX oddities, privacy concerns and more recent bloat. This ease of use also lowered the barrier to create a clan, so it captures a larger audience than its predecessors ever did. And yet it still provides powerful tools for moderation and user permissions, an API for chat bots, video streaming...