Our only source is this WSJ article (excerpt from qz[0]):

Discord declined to share how many Nitro subscribers it has, but the Wall Street Journal reported that Discord generated $130 million in revenue last year, up from $45 million in 2019. In the same time period, its monthly user base doubled.

0: https://qz.com/2034087/chat-app-discord-is-shedding-its-game....

we use discord for work and to "boost" your server to a level where you get reasonable streaming you need to pay ~$60 and a higher upload limit, or ~$110 for the max. Which is pretty good in that it applies for all users

It's a bit of an odd model for paying for businesses, but works well in the gaming world where multiple people can essentially help pay for a server (if you want the extra toys)

Why did you pick Discord over Slack or Teams? I'd be driven crazy if there wasn't any SSO or fancy admin features, but then again I'm a nerd who cares about things like that (and also why I really want Discord for Enterprise to happen). Is it just because it's easier to use?

I pay for nitro, I don't use discord non stop but it's great for a bunch of niche channels i'm on. I'm happy to pay $10 to a platform that makes it easier for me to find information and I know a bunch of my colleagues pay as well. All in we still support individual projects as well but truthfully it's the cost of a beer a month.