So what is Discord's path to profitability? They tried selling video games and closed the store not too long after launching it. Nitro/Server Boosts definitely don't come close to the cost of operation.
Honestly I also would like to enter to this market but breaking the market share of discord will be very hard indeed.
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...
It’s not just glorified IRC. The bandwidth and storage costs are real.