The Discord server in question claims "we got over 1,000 server boosts" [0]. That's Discord's monetization scheme, a sort of server-specific patreon subscription that users opt into, to collectively unlock features for that server specifically.

Judging by the going rate for "server boosts", Discord would have easily had $5,000 a month in revenue tied to that server [1].

[0] https://www.reddit.com/r/wallstreetbets/comments/l6j4r9/wher...

[1] https://support.discord.com/hc/en-us/articles/360028038352-S...