If you're paying for Discord every month, it's actually fairly expensive. A lot of the good features unlock once people start boosting servers with Nitros and those aren't cheap either. So I'd assume they aren't bleeding cash left and right on infra costs. They might actually breaking even on the infra costs at least.
For years I've had a little bet going with friends about who ends up buying them to subsidize all this. My money was on amazon, because it could work so well with twitch + amazon prime.
